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HTML

              
                div(class='loader')
  - var n = 0;
  while n < 8
    div(class='box box' + n++)
      div
  div(class='ground')
    div
    
small Weird Google Chrome Bug, you'll need to hover the body to make sure all is rendered - anyone knows a solution?

a(class='dribbble' href='https://dribbble.com/shots/7227469-3D-Boxes-Loader' target='_blank')
  img(src='https://dribbble.com/assets/logo-small-2x-9fe74d2ad7b25fba0f50168523c15fda4c35534f9ea0b1011179275383035439.png')
              
            
!

CSS

              
                :root {
    --background: #121621;
}

.loader {
    --duration: 3s;
    --primary: rgba(39, 94, 254, 1);
    --primary-light: #2f71ff;
    --primary-rgba: rgba(39, 94, 254, 0);
    width: 200px;
    height: 320px;
    position: relative;
    transform-style: preserve-3d;
    @media(max-width: 480px) {
        zoom: .44;
    }
    &:before,
    &:after {
        --r: 20.5deg;
        content: '';
        width: 320px;
        height: 140px;
        position: absolute;
        right: 32%;
        bottom: -11px;
        background: var(--background);
        transform: translateZ(200px) rotate(var(--r));
        animation: mask var(--duration) linear forwards infinite;
    }
    &:after {
        --r: -20.5deg;
        right: auto;
        left: 32%;
    }
    .ground {
        position: absolute;
        left: -50px;
        bottom: -120px;
        transform-style: preserve-3d;
        transform: rotateY(-47deg) rotateX(-15deg) rotateZ(15deg) scale(1);
        div {
            transform: rotateX(90deg) rotateY(0deg) translate(-48px, -120px) translateZ(100px) scale(0);
            width: 200px;
            height: 200px;
            background: var(--primary);
            background: linear-gradient(45deg, var(--primary) 0%, var(--primary) 50%, var(--primary-light) 50%, var(--primary-light) 100%);
            transform-style: preserve-3d;
            animation: ground var(--duration) linear forwards infinite;
            &:before,
            &:after {
                --rx: 90deg;
                --ry: 0deg;
                --x: 44px;
                --y: 162px;
                --z: -50px;
                content: '';
                width: 156px;
                height: 300px;
                opacity: 0;
                background: linear-gradient(var(--primary), var(--primary-rgba));
                position: absolute;
                transform: rotateX(var(--rx)) rotateY(var(--ry)) translate(var(--x), var(--y)) translateZ(var(--z));
                animation: ground-shine var(--duration) linear forwards infinite;
            }
            &:after {
                --rx: 90deg;
                --ry: 90deg;
                --x: 0;
                --y: 177px;
                --z: 150px;
            }
        }
    }
    .box {
        --x: 0;
        --y: 0;
        position: absolute;
        animation: var(--duration) linear forwards infinite;
        transform: translate(var(--x), var(--y));
        div {
            background-color: var(--primary);
            width: 48px;
            height: 48px;
            position: relative;
            transform-style: preserve-3d;
            animation: var(--duration) ease forwards infinite;
            transform: rotateY(-47deg) rotateX(-15deg) rotateZ(15deg) scale(0);
            &:before,
            &:after {
                --rx: 90deg;
                --ry: 0deg;
                --z: 24px;
                --y: -24px;
                --x: 0;
                content: '';
                position: absolute;
                background-color: inherit;
                width: inherit;
                height: inherit;
                transform: rotateX(var(--rx)) rotateY(var(--ry)) translate(var(--x), var(--y)) translateZ(var(--z));
                filter: brightness(var(--b, 1.2));
            }
            &:after {
                --rx: 0deg;
                --ry: 90deg;
                --x: 24px;
                --y: 0;
                --b: 1.4;
            }
        }
        &.box0 {
            --x: -220px;
            --y: -120px;
            left: 58px;
            top: 108px;
        }
        &.box1 {
            --x: -260px;
            --y: 120px;
            left: 25px;
            top: 120px;
        }
        &.box2 {
            --x: 120px;
            --y: -190px;
            left: 58px;
            top: 64px;
        }
        &.box3 {
            --x: 280px;
            --y: -40px;
            left: 91px;
            top: 120px;
        }
        &.box4 {
            --x: 60px;
            --y: 200px;
            left: 58px;
            top: 132px;
        }
        &.box5 {
            --x: -220px;
            --y: -120px;
            left: 25px;
            top: 76px;
        }
        &.box6 {
            --x: -260px;
            --y: 120px;
            left: 91px;
            top: 76px;
        }
        &.box7 {
            --x: -240px;
            --y: 200px;
            left: 58px;
            top: 87px;
        }
    }
    $i: 0;
    @while $i < 8 {
        .box#{$i} {
            animation-name: box-move#{$i};
            div {
                animation-name: box-scale#{$i};
            }
        }
        $i: $i + 1;
    }
}

$i: 0;
@while $i < 8 {
    $delay: $i * 4;
    @keyframes box-move#{$i} {
        #{12 + $delay}% {
            transform: translate(var(--x), var(--y));
        }
        #{25 + $delay}%,
        52% {
            transform: translate(0, 0);
        }
        80% {
            transform: translate(0, -32px);
        }
        90%,
        100% {
            transform: translate(0, 188px);
        }
    }
    @keyframes box-scale#{$i} {
        #{6 + $delay}% {
            transform: rotateY(-47deg) rotateX(-15deg) rotateZ(15deg) scale(0);
        }
        #{14 + $delay}%,
        100% {
            transform: rotateY(-47deg) rotateX(-15deg) rotateZ(15deg) scale(1);
        }
    }
    $i: $i + 1;
}

@keyframes ground {
    0%,
    65% {
        transform: rotateX(90deg) rotateY(0deg) translate(-48px, -120px) translateZ(100px) scale(0);
    }
    75%,
    90% {
        transform: rotateX(90deg) rotateY(0deg) translate(-48px, -120px) translateZ(100px) scale(1);
    }
    100% {
        transform: rotateX(90deg) rotateY(0deg) translate(-48px, -120px) translateZ(100px) scale(0);
    }
}

@keyframes ground-shine {
    0%,
    70% {
        opacity: 0;
    }
    75%,
    87% {
        opacity: .2;
    }
    100% {
        opacity: 0;
    }
}

@keyframes mask {
    0%,
    65% {
        opacity: 0;
    }
    66%,
    100% {
        opacity: 1;
    }
}

body {
    background: var(--background);
}

small {
    display: block;
    position: absolute;
    bottom: 20px;
    left: 50%;
    font-family: Arial;
    max-width: 320px;
    font-size: 12px;
    line-height: 19px;
    z-index: 1;
    color: #6C7486;
    @media(min-width: 481px) {
        transform: translateX(-50%);
        text-align: center;
    }
    @media(max-width: 480px) {
        left: 20px;
        right: 112px;
        font-size: 10px;
        line-height: 17px;
        transform: translateZ(400px);
    }
}

html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

* {
    box-sizing: inherit;
    &:before,
    &:after {
        box-sizing: inherit;
    }
}

// Center & dribbble
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    .dribbble {
        position: fixed;
        display: block;
        right: 24px;
        bottom: 24px;
        img {
            display: block;
            width: 76px;
        }
    }
}
              
            
!

JS

              
                // Weird Google Chrome Bug, you'll need to hover the body to make sure all is rendered - anyone knows a solution?
              
            
!
999px

Console