*{
  box-sizing:border-box;
}
body{
  background: linear-gradient(to top, #a18cd1 0%, #fbc2eb 100%);
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin : 0;
  padding: 0;

}

.wrapper{
  position: absolute;
  animation: x 1s ease-in-out alternate infinite 0s both;
}

.wrapper>div{
  width: 50px;
  height: 50px;
  
  background-color: #fff;
  border-radius: 100%;
  margin: 40px;
  animation: y 1s linear infinite 0s both;
}

@keyframes x {
  0%{
    transform:translatex(-100px)
  }
  100%{
    transform:translatex(100px)
  }
}

@keyframes y {
  25%{transform: translatey(-50px);}
  0%, 50%, 100%{transform: translatey(0);}
  75%{transform: translatey(50px);}
}


.wrapper:nth-of-type(2){animation-delay: 0.1s;}
.wrapper:nth-of-type(3){animation-delay: 0.2s;}
.wrapper:nth-of-type(4){animation-delay: 0.3s;}
.wrapper:nth-of-type(5){animation-delay: 0.4s;}

.wrapper:nth-of-type(2)>div{animation-delay: 0.1s;
height: 40px; width: 40px; opacity:0.8;}
.wrapper:nth-of-type(3)>div{animation-delay: 0.2s;
height: 30px; width: 30px; opacity:0.6;}
.wrapper:nth-of-type(4)>div{animation-delay: 0.3s;
height: 20px; width: 20px; opacity:0.4;}
.wrapper:nth-of-type(5)>div{animation-delay: 0.4s;
height: 10px; width: 10px; opacity:0.2;}