body {
    margin: 0;
    padding: 0;
}
div {
    height: 100vh;
    width: 100%;
    background-color: #eee;
    display: flex;
    justify-content: center;
    align-items: center;
}
div span {
    width: 5px;
    height: 5px;
    margin: 6px;
    border-radius: 10px;
    animation: scale 0.9s ease-in-out infinite;
}
div span:nth-child(1) {
    background-color: blue;
    animation-delay: -0.8s;
}
div span:nth-child(2) {
    background-color: green;
    animation-delay: -0.7s;
}
div span:nth-child(3) {
    background-color: yellow;
    animation-delay: -0.6s;
}
div span:nth-child(4) {
    background-color: yellow;
    animation-delay: -0.5s;
}
div span:nth-child(5) {
    background-color: blue;
    animation-delay: -0.4s;
}
@keyframes scale {
    0%, 40%, 100% {
        height: 5px;
    }
    20% {
        height: 60px;
    }
}