html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: system-ui, sans-serif;
    background: #111;
    color: white;
}

.presentation {
    min-height: 100svh;
}

.scene {
    display: none;
    position: relative;
    min-height: 100svh;
    overflow: hidden;
}

.scene.active {
    display: grid;
    place-items: center;
}

.scene-background {
    position: absolute;
    inset: 0;
    background-position: center;
    background-size: cover;
}

.scene-content {
    position: relative;
    z-index: 1;
    width: min(90%, 760px);
    padding: 2rem;
    text-align: center;
}

.presentation-controls {
    position: fixed;
    z-index: 10;
    left: 0;
    right: 0;
    bottom: 0;

    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: 1rem;
    align-items: center;

    padding: 1rem;
    background: rgb(0 0 0 / 70%);
}

.progress {
    height: 0.35rem;
    overflow: hidden;
    border-radius: 999px;
    background: rgb(255 255 255 / 25%);
}

#progress-bar {
    width: 0%;
    height: 100%;
    background: currentColor;
    transition: width 300ms ease;
}