body{
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: black;
    color: white;
    flex-direction: column;
}
div{
    background:yellow;
    color:black;
    width: 800px;
    height:800px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items:center;
    font-size: 5em;
    font-family: freeserif;
    line-height: 1.8em;
    text-align: center;
    img{
        width:36%;
        height:auto;
        position: absolute;
        left:0;
        opacity: .7;
        top:0;
        box-shadow:10px 10px 10px black;
    }
    input{
        position: absolute;
        animation: anim .3s linear 0s infinite alternate-reverse forwards running;
        &:nth-child(3){
          animation-delay: .2s;
          left: 8.3%; top: 17.7%;
        }
        &:nth-child(2){
          left: 16.0%; top: 17.0%;
        }
    }
}

@keyframes anim {
  0% { margin:3px 0 0 1px; }
  20% { margin:0 0 0 0; }
  50% { margin:-1px 0 0 2px; }
  70% { margin:3px 0 0 1px; }
  100% { margin:-1px 0 0 0; }
}