style.css

body {
  background: #202020;
}

header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  color: #fff;
  font-family: 'Courgette', cursive;
}
#container {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-gap: 10px;
  grid-auto-rows: minmax(100px, auto);
}

#container .img-placeholder div {
  display: flex;
  justify-content: center;
  align-items: center;
}

/*#container .img-placeholder div:hover {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}*/

#container img {
  cursor: pointer;
  width: 50%;
  height: 50%;
  text-align: center;
  background: #fff;
  /*box-shadow: 0 4px 2px -2px #fff;*/
}

#container img:after {
  position: absolute;
  bottom: -26px;
  content: '';
  height: 30px;
  width: 84%;
  margin: 0 8%;
  border-radius: 50%;
  background: red;
  opacity: 0.7;
  -webkit-filter: blur(10px);
  -webkit-transform: scale(1, 0.2);
  z-index: -1;
}

#container img.front {
  pointer-events: none;
}

#app {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
#app h1 {
  display: flex;
  justify-content: center;
}