*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}
.container{
    width: 100vw;
    height: 100vh;
    background-color: bisque;
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
}
span{
    width: 50px;
    height: 50px;
    background-color: black;
    border-radius: 50%;
    animation-name: loading;
    animation-duration: 1s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}
span:nth-child(1){
    animation-delay: 0s;
}
span:nth-child(2){
    animation-delay: 0.33s;
}
span:nth-child(3){
    animation-delay: 0.66s;
}
@keyframes loading{
    0%{
        scale: 1;
    }
    25%{
        scale: 0;
    }
    50%{
        scale: 1;
    }
    100%{
        scale: 1;
    }
}