html {
    height: 100%;
    background-color: black;
    min-height: 100%;
    margin: 0;
    padding: 0;
}
canvas {
    padding: 0;
    margin: auto;
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    justify-content: center;
    align-items: center;
    object-fit: contain;
    max-height: 100%;
    max-width: 100%;
    filter: drop-shadow(0 0 1.5rem #252525);
}
:root {
    --c1: #FFF;
    --c2: #000;
    --c3: #000;
    --c4: #FFF;
}

.loader {
    animation: rotate 3s infinite;
    height: 50px;
    width: 50px;
    position: absolute;
    left: calc(50% - 10px);
    top: calc(50% - 10px);
}

.loader:before,
.loader:after {
    border-radius: 50%;
    content: '';
    display: block;
    height: 20px;
    width: 20px;
}

.loader:before {
    animation: ball1 10s infinite;
    background-color: var(--c1);
    box-shadow: 30px 0 0 var(--c2);
    margin-bottom: 10px;
}

.loader:after {
    animation: ball2 10s infinite;
    background-color: var(--c3);
    box-shadow: 30px 0 0 var(--c4);
}

@keyframes rotate {
    0% {
        -webkit-transform: rotate(0deg) scale(0.8);
        -moz-transform: rotate(0deg) scale(0.8);
    }
    50% {
        -webkit-transform: rotate(360deg) scale(1.2);
        -moz-transform: rotate(360deg) scale(1.2);
    }
    100% {
        -webkit-transform: rotate(720deg) scale(0.8);
        -moz-transform: rotate(720deg) scale(0.8);
    }
}

@keyframes ball1 {
    0% {
        box-shadow: 30px 0 0 var(--c2);
    }
    50% {
        box-shadow: 0 0 0 var(--c2);
        margin-bottom: 0;
        -webkit-transform: translate(15px, 15px);
        -moz-transform: translate(15px, 15px);
    }
    100% {
        box-shadow: 30px 0 0 var(--c2);
        margin-bottom: 10px;
    }
}

@keyframes ball2 {
    0% {
        box-shadow: 30px 0 0 var(--c4);
    }
    50% {
        box-shadow: 0 0 0 var(--c4);
        margin-top: -20px;
        -webkit-transform: translate(15px, 15px);
        -moz-transform: translate(15px, 15px);
    }
    100% {
        box-shadow: 30px 0 0 var(--c4);
        margin-top: 0;
    }
}