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Did some refactoring. Due to the CSS stacking conflicts,
each div is now inside a wrapper. In this case it is the li tags.

    <div class="one"></div>
    <div class="two"></div>
    <div class="three"></div>
    <div class="four"></div>


                /* Some Resets */

body, ul, li {
  margin: 0;
  padding: 0;

ul, li {
  list-style: none;

body, ul {
  display: flex;
  justify-content: center;

ul {
  margin-top: 5em;
  flex-wrap: wrap;
  max-width: 40em;

li {
  transition: transform .5s;

div {
  margin: 2em;
  width: 15em;
  height: 15em;
  position: relative;

/* These are the main colors, Try changing yourself to test */

.one { background: #6FE7DD; }
.two { background: #3490DE; }
.three { background: #6639A6; }
.four { background: #EA5455; }

The transform is implemented on the wrapper,
so the ::after class can maintain the z-index.
If it was implemented on the div,
it would cause the ::after to move up the stack on hover state.

li:hover {
  transform: scale(1.2);
  cursor: pointer;

The trend for these colorful shadows,
are designed in a slightly different way.
They are NOT the standard drop shadows.
In tools like Sketch and Photoshop,
a rectangle less than the total width of the element,
is placed behind it, and then,
the drop shadow is implemented on that rectangle.

div::after {
  z-index: -1;
  content: '';
  background: inherit;
  opacity: 0;
  height: 20%;
  width: 70%;
  position: absolute;
  margin-left: auto; margin-right: auto; left: 0; right: 0;
  bottom: 0;
  filter: blur(.9em);
  transition: opacity 1s, bottom 0.5s;

div:hover::after {
  opacity: .85;
  bottom: -.75em;