*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
section{
    height: 100vh;
    width: 100%;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}
section .loader{
    height: 25px;
    width: 25px;
    /* background: red; */
    position: relative;
}
.loader .ball{
    position: absolute;
    height: 25px;
    width: 25px;
    border-radius: 50%;
}
.loader .upper{
    left: 0;
    top: -25px;
    background: #2da2ff;
    animation: upper 1s infinite;
}
@keyframes upper{
    50%,100%{
        top: 25px;
    }
}

.loader .right{
    bottom: 0;
    right: -25px;
    background: #ff337a;
     animation: right 1s infinite;
}
@keyframes right{
    50%,100%{
        right: 25px;
    }
}


.loader .lower{
    bottom: -25px;
    right: 0;
    background: #ffff00;
     animation: lower 1s infinite;
}
@keyframes lower{
    50%,100%{
        bottom: 25px;
    }
}

.loader .left{
    left: -25px;
    bottom: 0;
    background: #00ff00;
     animation: left 1s infinite;
}
@keyframes left{
    50%,100%{
        left: 25px;
    }
}