<div></div>
<div></div>
<div></div>
<div></div>

<section class="wrapper">
<button id="play">Play</button>
<button id="reset">Reset</button>
</section>

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box; 
}

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

div {
  margin: 20px;
  width: 200px;
  height: 100px;
  background: #f36;
  position: relative;
  
  &::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    background: lime;
    transform-origin: center;
    animation-duration: 1s;
    animation-timing-function: linear;
    animation-fill-mode: both;
    z-index: 2;
  }
  
  &:nth-child(1).play::before {
    animation-name: topAni;
  }
  
  &:nth-child(2).play::before {
    animation-name: rightAni;
    animation-delay: 1s;
    animation-duration: 2s;
  }
  &:nth-child(3).play::before {
    animation-name: bottomAni;
    animation-delay: 2s;
    animation-duration: 3s;
  }
  &:nth-child(4).play::before {
    animation-name: leftAni;
    animation-delay: 3s;
    animation-duration: 4s;
  }
}

@keyframes topAni {
  0% {
    background: lime;
  }
  
  50% {
    background: #f36; 
  }
  
  100% {
    transform: translate(-50%, -60px) rotate(45deg);
    background: #f36;
  }
}

@keyframes rightAni {
  0% {
    background: lime;
  }
  
  50% {
    background: #f36;
  }
  
  100% {
    transform: translate(90px, -50%) rotate(45deg);
    background: #f36;
  }
}

@keyframes bottomAni {
  0% {
    background: lime;
  }
  
  50% {
    background: #f36; 
  }
  
  100% {
    transform: translate(-50%, 40px) rotate(45deg);
    background: #f36;
  }
}

@keyframes leftAni {
  0% {
    bakcground: lime;
  }
  
  50% {
    background: #f36;
  }
  
  100% {
    transform: translate(-110px, -50%) rotate(45deg);
    background: #f36;
  }
}
.wrapper{
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
  top: 20px;
}
button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding:15px 30px;
  background: #1abc9c;
  color:rgb(255,255,255);
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow:0px 2px 2px rgba(0,0,0,0.2);
  border: 1px solid  rgba(0,0,0,0.3);
  border-radius: 5px;
  cursor: pointer;
  transition: all .2s ease;
  
  &:hover {
    filter: hue-rotate(45deg);
  }
}

const btnPlay = document.querySelector('#play');
const btnReset = document.querySelector('#reset');
const divEle = document.querySelectorAll('div');

btnPlay.addEventListener('click', function(){
  for(let i = 0; i < divEle.length; i++) {
    divEle[i].classList.add('play');
  }
}, false)

btnReset.addEventListener('click', function(){
  for(let i = 0; i < divEle.length; i++) {
    divEle[i].classList.remove('play');
  }
}, false)