.container {
  position: absolute;
  width: 200px;
  height: 200px;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

.item {
  width: 100px;
  height: 100px;
  position: absolute;
}

.item-1 {
  background-color: #FA5667;
  top: 0;
  left: 0;
  z-index: 1;
  -webkit-animation: item-1_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
          animation: item-1_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
}

.item-2 {
  background-color: #7A45E5;
  top: 0;
  right: 0;
  -webkit-animation: item-2_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
          animation: item-2_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
}

.item-3 {
  background-color: #1B91F7;
  bottom: 0;
  right: 0;
  z-index: 1;
  -webkit-animation: item-3_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
          animation: item-3_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
}

.item-4 {
  background-color: #FAC24C;
  bottom: 0;
  left: 0;
  -webkit-animation: item-4_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
          animation: item-4_move 1.8s cubic-bezier(.6,.01,.4,1) infinite;
}

@-webkit-keyframes item-1_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(0, 100px)} 
  50% {transform: translate(100px, 100px)} 
  75% {transform: translate(100px, 0)} 
}

@keyframes item-1_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(0, 100px)} 
  50% {transform: translate(100px, 100px)} 
  75% {transform: translate(100px, 0)} 
}

@-webkit-keyframes item-2_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(-100px, 0)} 
  50% {transform: translate(-100px, 100px)} 
  75% {transform: translate(0, 100px)} 
}

@keyframes item-2_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(-100px, 0)} 
  50% {transform: translate(-100px, 100px)} 
  75% {transform: translate(0, 100px)} 
}

@-webkit-keyframes item-3_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(0, -100px)} 
  50% {transform: translate(-100px, -100px)} 
  75% {transform: translate(-100px, 0)} 
}

@keyframes item-3_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(0, -100px)} 
  50% {transform: translate(-100px, -100px)} 
  75% {transform: translate(-100px, 0)} 
}

@-webkit-keyframes item-4_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(100px, 0)} 
  50% {transform: translate(100px, -100px)} 
  75% {transform: translate(0, -100px)} 
}

@keyframes item-4_move {
  0%, 100% {transform: translate(0, 0)} 
  25% {transform: translate(100px, 0)} 
  50% {transform: translate(100px, -100px)} 
  75% {transform: translate(0, -100px)} 
}