/* container */
.responsive-two-column-grid {
    display:block;
}

/* columns */
.responsive-two-column-grid > * {
    padding:1rem;
}

/* tablet breakpoint */
@media (min-width:768px) {
    .responsive-two-column-grid {
        display: grid;
        grid-template-columns: 1fr 3fr;
    }
}

nav ul {list-style-type: none;}