body {
  margin: 0
}
ul {
  margin: 0;
  padding: 0;
}

.accordion {
  display: flex;
  width: 100%;
  height: 400px;
  overflow: hidden;
}
@media only screen and (max-width : 600px) {
  .accordion {
  display: flex;
  width: 100%;
  height: 200px;
  overflow: hidden;
  }
}
.accordion li {
  position: relative;
  list-style: none;
  width: 20%;
  height: 100%;
  transition: all 0.3s;
}

.accordion li a {
  display: block;
  width: 100%;
  height: 100%;
  background: no-repeat center center #ccc;
  background-size: cover;
  transition: all 0.3s;
  -webkit-filter: saturate(50%);
  filter: saturate(50%);
}
.accordion li .accordion-img {
  position:relative;
  height: 100%;
  width: 100%;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  overflow: hidden;
  left: 0;
  right: 0;
}
.accordion li a img {
  position: absolute;
  top: 0;
  left: 50%;
  bottom: 0;
  margin: auto;
  height: 100%;
  transform: translateX(-50%);
}

.accordion li.active {
  z-index: 2;
}
.accordion li.active a {
  -webkit-filter: saturate(100%);
  filter: saturate(100%);
}
.accordion li.active .accordion-img {
  left: -30%;
  width: 200%;
}
.accordion li.active .accordion-img img {
/*transform: translateX(-50%);*/
}