*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    background: #edf1f4;
    min-height: 100vh;
}
.loader{
    display: flex;
    flex-direction: row;
}
.loader div{
    position: relative;
    width: 40px;
    height: 200px;
    margin: 20px;
    border-radius: 40px;
    overflow: hidden;
    background: linear-gradient(to bottom, #0000000d, #edf1f4);
    border: 2px solid #edf1f4;
    box-shadow: 15px 15px 20px #0000001a,
                -15px -15px 20px #fff,
                inset -5px -5px 5px #ffffff80,
                inset 5px 5px rgba(0, 0, 0, 0.05);
}
.loader div::before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    border-radius: 40px;
    box-shadow: 15px 15px 20px #0000001a,
                -15px -15px 20px #fff,
                inset -5px -5px 5px #ffffff80,
                inset 5px 5px rgba(0, 0, 0, 0.05);
}
.loader div::after{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 36px;
    height: 36px;
    background: #fff;
    border-radius: 50%;
    box-shadow: inset -5px -5px 5px #00000005,
                0 420px 0 400px #2129f3;
    animation: animate 2.5s ease-in-out infinite;
    animation-delay: calc(-0.5s * var(--i));
}
@keyframes animate{
    0%{
        transform: translateY(160px);
        filter: hue-rotate(180deg);
    }
    50%{
        transform: translateY(0px);
    }
    100%{
        transform: translateY(160px);
        filter: hue-rotate(0deg);
    }
}