.menu-container {
    position: sticky;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    z-index: 5;
    height: 100vh;
    top: 0;
    grid-row: span 2;
    width: 4.5rem;
    background-color: var(--main-color);
}
@media (orientation: portrait) {
    .menu-container {
        display: none;
    }
}
.menu-item {
    width: 4.5rem;
    height: 4.5rem;
    box-sizing: border-box;
    padding: 0.75rem;
    z-index: 6;
}
.menu-icon {
    width: 100%;
    aspect-ratio: 1 / 1;
}
.hidden-menu-container {
    display: none;
    position: fixed;
    overflow: hidden;
    width: 14rem;
    top: 0;
    bottom: 0;
    left: 4.5rem;
    background-color: var(--white);
    z-index: 4;
    -webkit-box-shadow: 0.5rem 0 2rem 1rem var(--shadow-color);
    -moz-box-shadow: 0.5rem 0 2rem 1rem var(--shadow-color);
    box-shadow: 0.5rem 0 2rem 1rem var(--shadow-color);
}
.hidden-menu-item {
    height: 4.5rem;
    line-height: 4.5rem;
    padding-left: 1.5rem;
    background-color: var(--white);
    color: var(--text-color-gray);
}
.hidden-menu-item-active {
    height: 4.5rem;
    line-height: 4.5rem;
    padding-left: 1.5rem;
    background-color: var(--main-color);
    color: var(--white);
}