Various thumbnails maybe needed for various parts of the pages. For example in the home screen you may need a large thumbnail but in the footer or in the sidebar, smaller ones are needed. The following code is a good example of generating similar thumbnails but with different sizes. Besides, it has a simple on-mouse hover effect. Look at the pictures top right! They have another bending effect!

HTML
<!-- this script got from www.devanswer.com -->
<div class="content"> <div class="row"> <div class="thumbnail lrg"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/thumbnail.jpg)"> <img src="http://devanswer.com/codes/files/thumbnail.jpg" /> </div> </div> <div class="thumbnail lrg"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/isometric-thumbnail.png)"> <img src="http://devanswer.com/codes/files/isometric-thumbnail.png" /> </div> </div> </div> <div class="row"> <div class="thumbnail med"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/thumbnail.jpg)"> <img src="http://devanswer.com/codes/files/thumbnail.jpg" /> </div> </div> <div class="thumbnail med"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/isometric-thumbnail.png)"> <img src="http://devanswer.com/codes/files/isometric-thumbnail.png" /> </div> </div> </div> <div class="row"> <div class="thumbnail sml"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/thumbnail.jpg)"> <img src="http://devanswer.com/codes/files/thumbnail.jpg" /> </div> </div> <div class="thumbnail sml"> <div class="document" style="--thumb-url: url(http://devanswer.com/codes/files/isometric-thumbnail.png)"> <img src="http://devanswer.com/codes/files/isometric-thumbnail.png" /> </div> </div> </div> <div class="row"> </div> </div><a style="font-size: 8pt; text-decoration: none" target="_blank" href="http://www.devanswer.com">Developer Code</a>
CSS
@font-face {
  font-family: 'barlow';
  src: font-url("http://devanswer.com/codes/files/Barlow-Regular.woff") format("woff");
  font-weight: 400;
  font-style: normal;
}
body {
  background-color: #ececee;
  display: flex;
  align-items: center;
  height: 100vh;
  font-family: 'barlow',sans-serif;
}

.content {
  margin: 0 auto;
}

.row {
  display: flex;
  justify-content: center;
}

.thumbnail {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 128px;
  width: 128px;
  font-size: 12px;
  margin: 1em;
  position: relative;
}
.thumbnail.sml {
  font-size: 8px;
  height: 64px;
  width: 64px;
}
.thumbnail.sml img {
  max-width: 64px;
  max-height: 64px;
}
.thumbnail.lrg {
  font-size: 18px;
  height: 256px;
  width: 256px;
}
.thumbnail.lrg img {
  max-width: 256px;
  max-height: 256px;
}
.thumbnail .document {
  position: relative;
  background-image: linear-gradient(-135deg, transparent 0%, transparent 50%, #c9c9cf 50%, white 62.5%, white 100%);
  background-size: 1.5em 1.5em;
  background-position: right .125em top .125em;
  background-repeat: no-repeat;
}
.thumbnail .document::before {
  content: "";
  position: absolute;
  background-image: linear-gradient(-90deg, rgba(0, 0, 0, 0.15), transparent), var(--thumb-url);
  background-size: .33em 1.5em, cover;
  background-position: top right,left center;
  background-repeat: no-repeat,no-repeat;
  top: 0;
  height: 100%;
  right: 1.5em;
  left: 0;
  border-top-right-radius: .4em;
}
.thumbnail .document::after {
  content: "";
  position: absolute;
  background-image: linear-gradient(rgba(0, 0, 0, 0.15), transparent), var(--thumb-url);
  background-size: 1.65em .33em, cover;
  background-position: top right,center bottom;
  background-repeat: no-repeat,no-repeat;
  top: 1.5em;
  bottom: 0;
  right: 0;
  left: 0;
  border-top-right-radius: .4em;
}
.thumbnail img {
  display: block;
  max-width: 128px;
  max-height: 128px;
  visibility: hidden;
}
.thumbnail::before {
  opacity: 0;
  content: "";
  position: absolute;
  left: 0px;
  right: 0px;
  top: 0px;
  bottom: 0px;
  z-index: -1;
  background-image: repeating-linear-gradient(-45deg, transparent, transparent 30%, currentColor 30%, currentColor 50%, transparent 50%);
  background-size: 4px 4px;
  border-radius: 3px;
  transition: .15s ease-in-out;
}
.thumbnail:hover::before {
  left: -.5em;
  right: -.5em;
  top: -.5em;
  bottom: -.5em;
  opacity: .125;
}

a {
  display: block;
  color: inherit;
  text-decoration: none;
  opacity: .5;
  font-size: 14px;
  padding: 1em;
}