.obs-scroll-top-button {
    position: fixed;
    right: var(--obs-scroll-top-right, 28px);
    bottom: var(--obs-scroll-top-bottom, 28px);
    width: var(--obs-scroll-top-size, 48px);
    height: var(--obs-scroll-top-size, 48px);
    z-index: var(--obs-scroll-top-z, 9999);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    border-radius: var(--obs-scroll-top-radius, 50%);
    background: var(--obs-scroll-top-bg, #333333);
    color: var(--obs-scroll-top-color, #ffffff);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .2s ease, visibility .2s ease, filter .2s ease;
    line-height: 1;
    appearance: none;
    -webkit-appearance: none;
    box-sizing: border-box;
}

.obs-scroll-top-button.is-obs-scroll-top-visible {
    opacity: var(--obs-scroll-top-opacity, .92);
    visibility: visible;
    pointer-events: auto;
}

.obs-scroll-top-button:hover,
.obs-scroll-top-button:focus-visible {
    opacity: 1;
    filter: brightness(1.08);
    outline: none;
}

.obs-scroll-top-button:focus-visible {
    box-shadow: 0 0 0 3px rgba(0,0,0,.18), 0 0 0 5px rgba(255,255,255,.7);
}

.obs-scroll-top-button svg {
    width: calc(var(--obs-scroll-top-size, 48px) * .54);
    height: calc(var(--obs-scroll-top-size, 48px) * .54);
    display: block;
    fill: currentColor;
}

.obs-scroll-top-shadow-none {
    box-shadow: none;
}

.obs-scroll-top-shadow-soft {
    box-shadow: 0 8px 20px rgba(0,0,0,.18);
}

.obs-scroll-top-shadow-hard {
    box-shadow: 4px 4px 0 rgba(0,0,0,.22);
}

@media (prefers-reduced-motion: reduce) {
    .obs-scroll-top-button {
        transition: opacity .01s linear, visibility .01s linear;
    }
}