style.css

body {
    margin: 0;
    display: flex;
    width: 100vw;
    height: 100vh;
    flex-direction: column;
}

footer {
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.inline-icon {
    height: 1em;
}

.main-container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100vw;
    flex-direction: row;
    gap: 20%;
}

.slider-and-label {
    display: flex;
    flex-direction: column;
}

.cube-controls {
    z-index: 1;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.qoobe {
    transform-style: preserve-3d;
    transition: all 0.1s linear;
    --cube-size: 120px;
    --half-cube-size: calc(var(--cube-size)/2);
    width: var(--cube-size);
    height: var(--cube-size);
    flex-shrink: 0;
    backface-visibility: hidden;
}

:has(.backface-toggle:checked) .qoobe {
    backface-visibility: visible;
}

.qoobe * {
    display: flex;
    width: 100%;
    height: 100%;
    border: 1px red solid;
    backface-visibility: visible;
    background-color: rgba(255, 0, 0, 0.1);
    align-items: center;
    justify-content: center;
    position: absolute;
    backface-visibility: inherit;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 30px;
}

.face-top {
    transform: rotateX(90deg) translateZ(var(--half-cube-size));
}

.face-bottom {
    transform: rotateX(270deg) translateZ(var(--half-cube-size));
}

.face-front {
    transform: translateZ(var(--half-cube-size));
}

.face-back {
    transform: rotateY(180deg) translateZ(var(--half-cube-size));
}

.face-left {
    transform: rotateY(90deg) translateZ(var(--half-cube-size));
}

.face-right {
    transform: rotateY(270deg) translateZ(var(--half-cube-size));
}