Fix the mdn redesign

mdn.css

@import url('https://fonts.cdnfonts.com/css/menlo');

.page-layout__banner {
    display: none;
}

:root {
    --font-family-code: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace;
    --color-background-page: #1b1b1b;
}

code {
    font-size: 0.833rem
}

.left-sidebar {
    scrollbar-color: var(--color-scrollbar-thumb) transparent;
    width: 80%;
}

.reference-toc a {
    padding: 8px 16px;
    color: var(--color-text-secondary);
}

.left-sidebar a {
    color: var(--color-text-secondary);
}

.reference-layout {
    padding-inline: 2rem;
}

.reference-layout__toc {
    margin-left: 2rem;
}