style.css

.container {
    max-width: var(--breakpoint-md, 768px);
}

.full-width {
    overflow-x: auto;
}

@media (min-width: 768px) {
    .full-width {
        width: 100vw;
        position: relative;
        left: 50%;
        right: 50%;
        margin-left: -50vw;
        margin-right: -50vw;
    }
    .full-width > * {
        width: auto;
        min-width: 738px;  /* 768px - 2 * 15px (padding) */
        margin: 0 auto;
    }
}