styles.css

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

.frame{
    background: #e56262;
    width: 400px;
    height: 400px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -200px;
    margin-left: -200px;
    border-radius: 2px;
    box-shadow: 1px 2px 10px 0px rgba(0, 0, 0, 0.5);
}

.center{
    position: absolute;
    width: 220px;
    height: 220px;
    top: 90px;
    left: 90px;
}

.dot{
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
    animation-fill-mode: both;
    animation-timing-function: ease-in-out; /* Smooth Start and end */
}

.dot-1{
    z-index: 3;
    width: 30px;
    height: 30px;
    top: 95px;
    left: 95px;
    animation: jump-1 2s infinite alternate;
}

.dot-2{
    z-index: 2;
    width: 60px;
    height: 60px;
    top: 80px;
    left: 80px;
    animation: jump-2 2s infinite alternate;
}

.dot-3{
    z-index: 1;
    width: 90px;
    height: 90px;
    top: 65px;
    left: 65px;
    animation: jump-3 2s infinite alternate;
}

@keyframes jump-1{
    0%, 70%{
        box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
        transform: scale(0); /* Start Small */
    }
    100%{
        box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
        transform: scale(1); /* Grow the full size */
    }
}

@keyframes jump-2{
    0%, 40%{
        box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
        transform: scale(0); /* Start Small */
    }
    100%{
        box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
        transform: scale(1); /* Grow the full size */
    }
}

@keyframes jump-3{
    0%, 10%{
        box-shadow: 2px 2px 3px 2px rgba(0, 0, 0, 0.2);
        transform: scale(0); /* Start Small */
    }
    100%{
        box-shadow: 10px 10px 15px 0 rgba(0, 0, 0, 0.3);
        transform: scale(1); /* Grow the full size */
    }
}