.container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.main  { flex: 4; }

aside { margin-top: 3em; }

aside.but {
    flex: 1;
    background-color: #00847d;
    border-radius: 6px;
    padding: 1em;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s;
}

aside.but:hover { background-color: #006b65; }

aside.but  p { margin: 0; }

aside.but a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    text-transform: uppercase;
    display: block;
}

.page-layout {
    display: flex;
    gap: 2em;
    align-items: flex-start;
}

.page-layout > .content-area { flex: 4; }

aside.toc {
    flex: 1.5;
    margin-top: 2em;
    margin-left: 1em;
    background: none;
    box-shadow: none;
    padding: 0;
    text-align: left;
    position: sticky;
    top: 1em;
}

aside.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

aside.toc li { margin-bottom: 0.3em; }

aside.toc a {
    color: inherit;
    font-weight: normal;
    font-size: 1rem;
    font-weight: bold;
    color: #00847d;
    text-transform: none;
    text-decoration: none;
    display: inline;
}

dt { color: #00847d; }