The following code provides a special menu. It has many features like multilevel auto-expanding items, notifications count, opening and closing effects, and etc. Just click on the top left button and you will see the menu slides in. When you don’t want it, click on close button, so the menu floats out.

HTML
<!-- this script got from www.devanswer.com -->
<input id="hamburger" class="hamburger" type="checkbox" /> <label for="hamburger" class="hamburger"> <i></i> <text> <close>close</close> <open>menu</open> </text> </label> <nav class="primnav"> <ul> <li> <a title="Dashboard" href="#dashboard"> <svg class="icon"><use xlink:href="#icon-th-large"></use></svg> Dashboard </a> </li> <li> <a title="Mail" href="#mail"> <svg class="icon"><use xlink:href="#icon-mail_outline"></use></svg> Mail <div class="tag">53</div> </a> <ul class="secnav"> <li> <a title="Inbox" href="#inbox">Inbox</a> </li> <li> <a title="Sent" href="#sent">Sent</a> </li> </ul> </li> <li> <a title="Notifications" href="#notifications"> <svg class="icon"><use xlink:href="#icon-bell2"></use></svg> Notifications <div class="tag">17</div> </a> </li> <li> <a title="System Administration" href="#sysadmin"> <svg class="icon"><use xlink:href="#icon-equalizer"></use></svg> System Administration </a> <ul class="secnav"> <li> <a title="Users" href="#users">Users</a> </li> <li> <a title="Lists" href="#lists">Lists</a> </li> <li> <a title="Calendar" href="#calendar">Calendar</a> </li> </ul> </li> </ul> </nav> <content> <ul class="features"> <li> <svg class="icon"><use xlink:href="#icon-chrome"></use></svg> <svg class="icon"><use xlink:href="#icon-safari"></use></svg> <svg class="icon"><use xlink:href="#icon-edge"></use></svg> <svg class="icon"><use xlink:href="#icon-firefox"></use></svg> <svg class="icon"><use xlink:href="#icon-IE"></use></svg> <svg class="icon"><use xlink:href="#icon-opera"></use></svg> <svg class="icon"><use xlink:href="#icon-appleinc"></use></svg> <svg class="icon"><use xlink:href="#icon-android"></use></svg> </li> </ul> </content> <svg style="position: absolute; width: 0; height: 0;" width="0" height="0" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <symbol id="icon-expand" viewBox="0 0 27 32"> <title>expand</title> <path class="path1" d="M13.482 18.857c0 0.143-0.071 0.304-0.179 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class="path15" d="M29.322 20.302l-1.436-0.435 0.145-0.479 1.436 0.435-0.145 0.479z"></path> <path class="path16" d="M2.315 13.024l2.942 0.585-0.098 0.49-2.942-0.585 0.098-0.49z"></path> <path class="path17" d="M29.679 18.976l-2.942-0.585 0.098-0.49 2.942 0.585-0.098 0.49z"></path> <path class="path18" d="M2.218 18.486l2.942-0.585 0.098 0.49-2.942 0.585-0.098-0.49z"></path> <path class="path19" d="M29.776 13.513l-2.942 0.585-0.098-0.49 2.942-0.585 0.098 0.49z"></path> <path class="path20" d="M2.53 19.829l1.435-0.436 0.145 0.478-1.435 0.436-0.145-0.478z"></path> <path class="path21" d="M29.468 12.178l-1.435 0.436-0.145-0.478 1.435-0.436 0.145 0.478z"></path> <path class="path22" d="M3.161 21.591l-0.191-0.462 2.772-1.148 0.191 0.462-2.772 1.148z"></path> <path class="path23" d="M28.837 10.413l0.191 0.462-2.772 1.148-0.191-0.462 2.772-1.148z"></path> <path class="path24" d="M3.776 22.821l-0.236-0.441 1.323-0.707 0.236 0.441-1.323 0.707z"></path> <path class="path25" d="M28.233 9.181l0.236 0.441-1.323 0.707-0.236-0.441 1.323-0.707z"></path> <path class="path26" d="M9.621 28.464l-0.441-0.236 0.707-1.323 0.441 0.236-0.707 1.323z"></path> <path class="path27" d="M22.377 3.534l0.441 0.236-0.707 1.323-0.441-0.236 0.707-1.323z"></path> <path class="path28" d="M10.415 28.837l1.148-2.772 0.462 0.191-1.148 2.772-0.462-0.191z"></path> <path class="path29" d="M21.59 3.16l-1.148 2.772-0.462-0.191 1.148-2.772 0.462 0.191z"></path> <path class="path30" d="M12.176 29.47l-0.478-0.145 0.435-1.435 0.478 0.145-0.435 1.435z"></path> <path class="path31" d="M19.823 2.528l0.479 0.145-0.435 1.436-0.479-0.145 0.435-1.436z"></path> <path class="path32" d="M13.515 29.776l-0.49-0.098 0.585-2.942 0.49 0.098-0.585 2.942z"></path> <path class="path33" d="M18.485 2.218l0.49 0.098-0.585 2.942-0.49-0.098 0.585-2.942z"></path> </symbol> <symbol id="icon-opera" viewBox="0 0 32 32"> <title>opera</title> <path class="path1" d="M32 16v0 0c0 4.738-2.063 9-5.337 11.925-4.106 2-7.931 0.6-9.194-0.275 4.031-0.881 7.075-5.756 7.075-11.65s-3.044-10.769-7.075-11.656c1.269-0.875 5.094-2.275 9.194-0.275 3.275 2.931 5.337 7.194 5.337 11.931v0 0z"></path> <path class="path2" d="M10.731 6.981c-1.769 2.087-2.912 5.175-2.987 8.644 0 0.006 0 0.744 0 0.756 0.075 3.462 1.225 6.55 2.994 8.637 2.294 2.981 5.706 4.869 9.519 4.869 2.344 0 4.538-0.712 6.413-1.956-2.837 2.531-6.575 4.069-10.669 4.069-0.256 0-0.512-0.006-0.762-0.019-8.481-0.4-15.238-7.4-15.238-15.981 0-8.838 7.162-16 16-16 0.019 0 0.038 0 0.063 0 4.075 0.013 7.787 1.55 10.606 4.075-1.875-1.244-4.069-1.962-6.413-1.962-3.813 0-7.225 1.887-9.525 4.869z"></path> </symbol> <symbol id="icon-android" viewBox="0 0 32 32"> <title>android</title> <path class="path1" d="M28 12c-1.1 0-2 0.9-2 2v8c0 1.1 0.9 2 2 2s2-0.9 2-2v-8c0-1.1-0.9-2-2-2zM4 12c-1.1 0-2 0.9-2 2v8c0 1.1 0.9 2 2 2s2-0.9 2-2v-8c0-1.1-0.9-2-2-2zM7 23c0 1.657 1.343 3 3 3v0 4c0 1.1 0.9 2 2 2s2-0.9 2-2v-4h4v4c0 1.1 0.9 2 2 2s2-0.9 2-2v-4c1.657 0 3-1.343 3-3v-11h-18v11z"></path> <path class="path2" d="M24.944 10c-0.304-2.746-1.844-5.119-4.051-6.551l1.001-2.001c0.247-0.494 0.047-1.095-0.447-1.342s-1.095-0.047-1.342 0.447l-1.004 2.009-0.261-0.104c-0.893-0.297-1.848-0.458-2.84-0.458s-1.947 0.161-2.84 0.458l-0.261 0.104-1.004-2.009c-0.247-0.494-0.848-0.694-1.342-0.447s-0.694 0.848-0.447 1.342l1.001 2.001c-2.207 1.433-3.747 3.805-4.051 6.551v1h17.944v-1h-0.056zM13 8c-0.552 0-1-0.448-1-1s0.447-0.999 0.998-1c0.001 0 0.002 0 0.003 0s0.001-0 0.002-0c0.551 0.001 0.998 0.448 0.998 1s-0.448 1-1 1zM19 8c-0.552 0-1-0.448-1-1s0.446-0.999 0.998-1c0 0 0.001 0 0.002 0s0.002-0 0.003-0c0.551 0.001 0.998 0.448 0.998 1s-0.448 1-1 1z"></path> </symbol> <symbol id="icon-appleinc" viewBox="0 0 32 32"> <title>appleinc</title> <path class="path1" d="M24.734 17.003c-0.040-4.053 3.305-5.996 3.454-6.093-1.88-2.751-4.808-3.127-5.851-3.171-2.492-0.252-4.862 1.467-6.127 1.467-1.261 0-3.213-1.43-5.28-1.392-2.716 0.040-5.221 1.579-6.619 4.012-2.822 4.897-0.723 12.151 2.028 16.123 1.344 1.944 2.947 4.127 5.051 4.049 2.026-0.081 2.793-1.311 5.242-1.311s3.138 1.311 5.283 1.271c2.18-0.041 3.562-1.981 4.897-3.931 1.543-2.255 2.179-4.439 2.216-4.551-0.048-0.022-4.252-1.632-4.294-6.473zM20.705 5.11c1.117-1.355 1.871-3.235 1.665-5.11-1.609 0.066-3.559 1.072-4.713 2.423-1.036 1.199-1.942 3.113-1.699 4.951 1.796 0.14 3.629-0.913 4.747-2.264z"></path> </symbol> <symbol id="icon-home2" viewBox="0 0 32 32"> <title>home2</title> <path class="path1" d="M16 1l-16 16 3 3 3-3v13h8v-6h4v6h8v-13l3 3 3-3-16-16zM16 14c-1.105 0-2-0.895-2-2s0.895-2 2-2c1.105 0 2 0.895 2 2s-0.895 2-2 2z"></path> </symbol> <symbol id="icon-cart" viewBox="0 0 32 32"> <title>cart</title> <path class="path1" d="M12 29c0 1.657-1.343 3-3 3s-3-1.343-3-3c0-1.657 1.343-3 3-3s3 1.343 3 3z"></path> <path class="path2" d="M32 29c0 1.657-1.343 3-3 3s-3-1.343-3-3c0-1.657 1.343-3 3-3s3 1.343 3 3z"></path> <path class="path3" d="M32 16v-12h-24c0-1.105-0.895-2-2-2h-6v2h4l1.502 12.877c-0.915 0.733-1.502 1.859-1.502 3.123 0 2.209 1.791 4 4 4h24v-2h-24c-1.105 0-2-0.895-2-2 0-0.007 0-0.014 0-0.020l26-3.98z"></path> </symbol> <symbol id="icon-equalizer" viewBox="0 0 32 32"> <title>equalizer</title> <path class="path1" d="M14 4v-0.5c0-0.825-0.675-1.5-1.5-1.5h-5c-0.825 0-1.5 0.675-1.5 1.5v0.5h-6v4h6v0.5c0 0.825 0.675 1.5 1.5 1.5h5c0.825 0 1.5-0.675 1.5-1.5v-0.5h18v-4h-18zM8 8v-4h4v4h-4zM26 13.5c0-0.825-0.675-1.5-1.5-1.5h-5c-0.825 0-1.5 0.675-1.5 1.5v0.5h-18v4h18v0.5c0 0.825 0.675 1.5 1.5 1.5h5c0.825 0 1.5-0.675 1.5-1.5v-0.5h6v-4h-6v-0.5zM20 18v-4h4v4h-4zM14 23.5c0-0.825-0.675-1.5-1.5-1.5h-5c-0.825 0-1.5 0.675-1.5 1.5v0.5h-6v4h6v0.5c0 0.825 0.675 1.5 1.5 1.5h5c0.825 0 1.5-0.675 1.5-1.5v-0.5h18v-4h-18v-0.5zM8 28v-4h4v4h-4z"></path> </symbol> <symbol id="icon-mail_outline" viewBox="0 0 32 32"> <title>mail_outline</title> <path class="path1" d="M16 14.688l10.688-6.688h-21.375zM26.688 24v-13.313l-10.688 6.625-10.688-6.625v13.313h21.375zM26.688 5.313c1.438 0 2.625 1.25 2.625 2.688v16c0 1.438-1.188 2.688-2.625 2.688h-21.375c-1.438 0-2.625-1.25-2.625-2.688v-16c0-1.438 1.188-2.688 2.625-2.688h21.375z"></path> </symbol> <symbol id="icon-enlarge2" viewBox="0 0 32 32"> <title>enlarge2</title> <path class="path1" d="M32 0v13l-5-5-6 6-3-3 6-6-5-5zM14 21l-6 6 5 5h-13v-13l5 5 6-6z"></path> </symbol> <symbol id="icon-th-large" viewBox="0 0 30 32"> <title>th-large</title> <path class="path1" d="M13.714 18.286v6.857c0 1.25-1.036 2.286-2.286 2.286h-9.143c-1.25 0-2.286-1.036-2.286-2.286v-6.857c0-1.25 1.036-2.286 2.286-2.286h9.143c1.25 0 2.286 1.036 2.286 2.286zM13.714 4.571v6.857c0 1.25-1.036 2.286-2.286 2.286h-9.143c-1.25 0-2.286-1.036-2.286-2.286v-6.857c0-1.25 1.036-2.286 2.286-2.286h9.143c1.25 0 2.286 1.036 2.286 2.286zM29.714 18.286v6.857c0 1.25-1.036 2.286-2.286 2.286h-9.143c-1.25 0-2.286-1.036-2.286-2.286v-6.857c0-1.25 1.036-2.286 2.286-2.286h9.143c1.25 0 2.286 1.036 2.286 2.286zM29.714 4.571v6.857c0 1.25-1.036 2.286-2.286 2.286h-9.143c-1.25 0-2.286-1.036-2.286-2.286v-6.857c0-1.25 1.036-2.286 2.286-2.286h9.143c1.25 0 2.286 1.036 2.286 2.286z"></path> </symbol> </defs> </svg> <link href="https://fonts.googleapis.com/css?family=Roboto:300,400" rel="stylesheet"> <link href="https://fonts.googleapis.com/css?family=Pacifico" rel="stylesheet"><a style="font-size: 8pt; text-decoration: none" target="_blank" href="http://www.devanswer.com">Developer Code</a>

CSS
html {
  font-family: 'Lato', sans-serif;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

input.hamburger {
  display: none;
}
input.hamburger:checked ~ label > i {
  background-color: transparent;
  -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
}
input.hamburger:checked ~ label > i:before {
  -webkit-transform: translate(-50%, 0%) rotate(45deg);
          transform: translate(-50%, 0%) rotate(45deg);
}
input.hamburger:checked ~ label > i:after {
  -webkit-transform: translate(-50%, 0%) rotate(-45deg);
          transform: translate(-50%, 0%) rotate(-45deg);
}
input.hamburger:checked ~ label > div::after {
  width: 100%;
}
input.hamburger:checked ~ label > div::before {
  width: 0;
}

label.hamburger {
  z-index: 9999;
  position: relative;
  display: block;
  height: 50px;
  width: 50px;
}
label.hamburger:hover {
  cursor: pointer;
}
label.hamburger > div {
  font-size: .8em;
}
label.hamburger > div::after, label.hamburger > div::before {
  top: 100%;
  width: 100%;
  text-align: center;
  position: absolute;
  overflow: hidden;
  transition: width .25s .35s, color .45s .35s;
}
label.hamburger > div::after {
  content: 'CLOSE';
  right: 0;
  width: 0;
}
label.hamburger > div::before {
  content: 'OPEN';
  left: 0;
}
label.hamburger > i {
  position: absolute;
  width: 100%;
  height: 2px;
  top: 50%;
  background-color: #222;
  pointer-events: auto;
  transition-duration: .35s;
  transition-delay: .35s;
}
label.hamburger > i:before, label.hamburger > i:after {
  position: absolute;
  display: block;
  width: 100%;
  height: 2px;
  left: 50%;
  background-color: #222;
  content: "";
  transition: -webkit-transform 0.35s;
  transition: transform 0.35s;
  transition: transform 0.35s, -webkit-transform 0.35s;
  -webkit-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
}
label.hamburger > i:before {
  -webkit-transform: translate(-50%, -14px);
          transform: translate(-50%, -14px);
}
label.hamburger > i:after {
  -webkit-transform: translate(-50%, 14px);
          transform: translate(-50%, 14px);
}

html {
  font-family: 'Roboto', sans-serif;
}

body {
  margin: 0;
  overflow-x: hidden;
  height: 100vh;
  width: 100vw;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.primnav li:hover, .primnav expand:hover {
  background-color: #66a9e0;
  background-color: rgba(0, 112, 204, 0.6);
}

.primnav {
  position: fixed;
  height: 58px;
  width: 100vw;
  font-size: .8em;
  text-transform: uppercase;
  background-color: #007ee6;
  display: flex;
  flex-direction: column;
  transition: height 246ms .5s ease;
  padding-top: 58px;
  overflow-x: hidden;
  overflow-y: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.8);
  box-sizing: border-box;
  z-index: 1;
}
@media (min-width: 650px) {
  .primnav {
    height: 100vh;
    width: 58px;
    transition: width 246ms .5s ease;
  }
}
.primnav > ul {
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
}
.primnav li {
  font-weight: 400;
  position: relative;
}
.primnav li .tag {
  background-color: #005aa3;
  background-color: rgba(0, 112, 204, 0.8);
  color: rgba(255, 255, 255, 0.8);
  color: #e6e6e6;
  color: rgba(255, 255, 255, 0.9);
  padding: 0 .5em;
  border-radius: 2em;
  margin-left: auto;
  margin-right: .75em;
}
.primnav li a {
  position: relative;
  display: flex;
  align-items: center;
  white-space: nowrap;
  color: white;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}
.primnav .icon {
  height: 20px;
  flex-shrink: 0;
  width: 20px;
  padding: 19px;
  margin-right: 5px;
  padding-bottom: 15px;
  color: #e6e6e6;
  color: rgba(255, 255, 255, 0.9);
}

.secnav {
  margin-left: 63px;
  border-left: 1px solid black;
  border-left-color: #0065b8;
  border-left-color: rgba(0, 112, 204, 0.9);
  overflow: hidden;
}
.secnav li {
  color: #e6e6e6;
  color: rgba(255, 255, 255, 0.9);
  max-height: 100px;
  transition: max-height .1s;
}
@media (min-width: 650px) {
  .secnav li {
    max-height: 0px;
    transition: max-height .5s .5s;
  }
}
.secnav li a {
  text-transform: initial;
  display: block;
  color: inherit;
  padding: .75em 10px;
}

user {
  padding: 5px;
  padding-bottom: 3px;
  flex-shrink: 0;
  position: fixed;
  font-weight: 400;
  right: 0;
  color: white;
  color: rgba(255, 255, 255, 0.9);
  z-index: 99999;
}
user > section {
  display: flex;
  flex-direction: row-reverse;
  align-items: center;
}
user > section > section {
  display: flex;
  flex-direction: column;
  white-space: nowrap;
}
user img {
  height: 51px;
  width: 48px;
  -webkit-clip-path: circle(50% at 50% 50%);
          clip-path: circle(50% at 50% 50%);
  margin-left: 10px;
  min-height: 51px;
  min-width: 48px;
  align-items: flex-end;
}
user name {
  font-weight: 400;
}
user actions {
  padding: .1em 0;
  font-size: .8em;
  display: flex;
  justify-content: flex-end;
}
user actions a {
  padding: 0 .5em;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}
user actions a:last-child {
  padding-right: 0;
}

content {
  font-family: 'Pacifico', cursive;
  color: rgba(255, 255, 255, 0.9);
  font-size: 8vw;
  letter-spacing: 1px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #0070cc;
  height: 100%;
  padding-top: 58px;
  box-sizing: border-box;
  position: relative;
}
@media (min-width: 650px) {
  content {
    padding-left: 58px;
    padding-top: 0;
  }
}

.features {
  font-family: 'Lato', sans-serif;
  font-size: 1rem;
  text-transform: uppercase;
}
.features li {
  width: 100%;
  text-align: center;
  padding: .25em;
}

/**
    SCROLLBAR STYLE FOR IE
*/
body {
  scrollbar-base-color: #0070cc;
  scrollbar-3dlight-color: #fff;
  scrollbar-highlight-color: #0070cc;
  scrollbar-track-color: #0070cc;
  scrollbar-arrow-color: #0070cc;
  scrollbar-shadow-color: #0070cc;
  scrollbar-dark-shadow-color: #0070cc;
  -ms-overflow-style: -ms-autohiding-scrollbar;
}

.icon {
  display: inline-block;
  width: 5vw;
  height: 4vw;
  stroke-width: 0;
  stroke: currentColor;
  fill: currentColor;
}

/** hamburger */
input.hamburger {
  display: none;
}
input.hamburger:checked ~ nav.primnav {
  height: 100vh;
}
@media (min-width: 650px) {
  input.hamburger:checked ~ nav.primnav {
    width: 275px;
  }
}
@media (min-width: 650px) {
  input.hamburger:checked ~ nav.primnav .secnav > li {
    max-height: 100px;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(1) {
    transition: max-height 0.5s 0.67s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(2) {
    transition: max-height 0.5s 0.69s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(3) {
    transition: max-height 0.5s 0.71s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(4) {
    transition: max-height 0.5s 0.73s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(5) {
    transition: max-height 0.5s 0.75s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(6) {
    transition: max-height 0.5s 0.77s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(7) {
    transition: max-height 0.5s 0.79s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(8) {
    transition: max-height 0.5s 0.81s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(9) {
    transition: max-height 0.5s 0.83s ease-in;
  }
  input.hamburger:checked ~ nav.primnav .secnav > li:nth-child(10) {
    transition: max-height 0.5s 0.85s ease-in;
  }
}
input.hamburger:checked ~ label > i {
  background-color: transparent;
  -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
}
input.hamburger:checked ~ label > i:before {
  -webkit-transform: translate(-50%, -50%) rotate(45deg);
          transform: translate(-50%, -50%) rotate(45deg);
}
input.hamburger:checked ~ label > i:after {
  -webkit-transform: translate(-50%, -50%) rotate(-45deg);
          transform: translate(-50%, -50%) rotate(-45deg);
}
input.hamburger:checked ~ label close {
  color: rgba(255, 255, 255, 0.8);
  width: 100%;
}
input.hamburger:checked ~ label open {
  color: rgba(0, 0, 0, 0);
  width: 0;
}

label.hamburger {
  z-index: 9999;
  position: relative;
  display: block;
  height: 24px;
  width: 24px;
}
label.hamburger:hover {
  cursor: pointer;
}
label.hamburger text close,
label.hamburger text open {
  text-transform: uppercase;
  align-text: center;
  position: absolute;
  -webkit-transform: translateY(24px);
          transform: translateY(24px);
  text-align: center;
  overflow: hidden;
  transition: width .25s .35s, color .45s .35s;
  font-size: 6px;
}
label.hamburger text close {
  color: rgba(255, 255, 255, 0.8);
  right: 0;
  width: 0;
}
label.hamburger text open {
  color: rgba(255, 255, 255, 0.8);
  width: 100%;
}
label.hamburger > i {
  position: absolute;
  width: 100%;
  height: 2px;
  top: 50%;
  background-color: rgba(255, 255, 255, 0.8);
  pointer-events: auto;
  transition-duration: .35s;
  transition-delay: .35s;
}
label.hamburger > i:before, label.hamburger > i:after {
  position: absolute;
  display: block;
  width: 100%;
  height: 2px;
  left: 50%;
  background-color: rgba(255, 255, 255, 0.8);
  content: "";
  transition: -webkit-transform 0.35s;
  transition: transform 0.35s;
  transition: transform 0.35s, -webkit-transform 0.35s;
  -webkit-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
}
label.hamburger > i:before {
  -webkit-transform: translate(-50%, -7px);
          transform: translate(-50%, -7px);
}
label.hamburger > i:after {
  -webkit-transform: translate(-50%, 7px);
          transform: translate(-50%, 7px);
}

label.hamburger {
  position: fixed;
  top: 14px;
  left: 17px;
}

.tabs {
  font-family: 'Roboto', sans-serif;
  text-transform: uppercase;
  font-size: 1rem;
  position: fixed;
  top: 58px;
  left: 0;
  background-color: #007ee6;
  border-bottom: 1px solid #0062b3;
  width: 100vw;
  box-sizing: border-box;
}
@media (min-width: 650px) {
  .tabs {
    padding-left: calc(58px + .5rem);
    top: calc(58px - 3em);
    background-color: #0070cc;
    border: 0;
  }
}
.tabs > ul {
  display: flex;
  justify-content: space-around;
  overflow-x: auto;
  flex-wrap: wrap;
}
@media (min-width: 650px) {
  .tabs > ul {
    justify-content: flex-start;
  }
}
.tabs .tab {
  font-weight: 300;
  font-size: .7em;
  padding: 1em .75em;
  white-space: nowrap;
  flex-shrink: 0;
  display: block;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}
.tabs .tab:hover {
  background-color: #0062b3;
  cursor: pointer;
}