main {
    display: flex;
    flex-wrap: nowrap;
    height: 100vh;
    min-height: 100vh;
    overflow-x: auto;
    overflow-y: hidden;
}

.btn-toggle {
    display: inline-flex;
    align-items: center;
    padding: .25rem .5rem;
    font-weight: 600;
    color: rgba(0, 0, 0, .65);
    background-color: transparent;
    border: 0;
}

.btn-toggle::before {
    width: 1.25em;
    line-height: 0;
    content: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='rgba%280,0,0,.5%29' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 14l6-6-6-6'/%3e%3c/svg%3e");
    transition: transform .35s ease;
    transform-origin: .5em 50%;
}

.btn-toggle[aria-expanded="true"] {
    color: rgba(0, 0, 0, .85);
}
.btn-toggle[aria-expanded="true"]::before {
    transform: rotate(90deg);
}

.btn-toggle-nav a {
    display: inline-flex;
    padding: .1875rem .5rem;
    margin-top: .125rem;
    margin-left: 1.25rem;
    text-decoration: none;
}
/*
 * Bootstrap ratio
 */
.ratio {
    position: relative;
    width: 100%;
}
.ratio::before {
    display: block;
    padding-top: var(--bs-aspect-ratio);
    content: "";
}
.ratio > * {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.ratio-1x1 {
    --bs-aspect-ratio: 100%;
}

.ratio-4x3 {
    --bs-aspect-ratio: 75%;
}

.ratio-16x9 {
    --bs-aspect-ratio: 56.25%;
}

.ratio-21x9 {
    --bs-aspect-ratio: 42.8571428571%;
}