/* Add a background box to the sidebar */
.md-sidebar__inner {
    background: rgba(255,255,255,0.05); /* or any color/gradient you like */
    padding: 1rem;
    border-radius: 8px;
}

.md-nav__title {
    background: transparent !important;
    color: #aaa;
    font-weight: bold;
    box-shadow: none !important;
}

.md-nav__link {
    background: transparent !important;
    color: #aaa;
    box-shadow: none !important;
}