Moving backgrounds are more attractive than static ones. They absorb visitors’ attentions and create unforgettable experience for them. The following script moves some triangles dynamically from left of the page to its right. Simple and beautiful!

HTML
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CSS
body {
  background: #000;
}

svg {
  height: 140%;
  display: block;
  position: absolute;
  left: 0;
  top: -100px;
}

.title-block {
  position: absolute;
  left: 50%;
  top: 45%;
}
.title-block .title {
  position: relative;
  left: -50%;
  color: #fff;
  text-align: center;
  font-family: 'Lato';
  letter-spacing: 5px;
}

#top .st48,
#top .st52,
#top .st50 {
  animation: drift-right-up 80s alternate;
}
#top .st33,
#top .st51 {
  animation: drift-right-up 75s alternate;
}
#top .st49,
#top .st42 {
  animation: drift-right-up 65s alternate;
}

#bottom .st11,
#bottom .st56 {
  animation: drift-down 70s alternate;
}
#bottom .st53,
#bottom .st54 {
  animation: drift-right 195s alternate;
}
#bottom .st55,
#bottom .st36,
#bottom .st33 {
  animation: drift-down 115s alternate;
}
#bottom .st51 {
  animation: drift-down-right 105s alternate;
}

#nearright .st40,
#nearright .st43,
#nearright .st33 {
  animation: drift-right 115s;
}
#nearright .st41,
#nearright .st44 {
  animation: drift-right-up 105s;
}
#nearright .st42,
#nearright .st45,
#nearright .st46,
#nearright .st55,
#nearright .st47 {
  animation: drift-right 135s;
}

#farright .st54,
#farright .st58,
#farright .st59 {
  animation: drift-right 55s;
}
#farright .st57,
#farright .st51 {
  animation: drift-right-up 40s;
}

@keyframes drift-right {
  100% {
    transform: translate(2000px, -20px);
  }
}
@keyframes drift-right-up {
  100% {
    transform: translate(2000px, -250px);
  }
}
@keyframes drift-up {
  100% {
    transform: translate(10px, -1450px);
  }
}
@keyframes drift-up-right {
  100% {
    transform: translate(175px, -1550px);
  }
}
@keyframes drift-down {
  100% {
    transform: translate(2000px, 1220px);
  }
}
@keyframes drift-down-right {
  100% {
    transform: translate(1450px, 320px);
  }
}