.left-sidebar {

padding: {
    top: 1em;
    bottom: 1em;
    left: 2em;
    right: 2em;
}
background-color: #f8f9fa;
overflow-y: auto;

.left-sidebar-item {
    display: block;
    font-weight: 700;
    color: #333;
    text-decoration: none;
    margin: {
        top: 1em;
    }

    &:first-child {
        margin: {
            top: 0;
        }
    }

    &.active {
        color: #007bff
    }
}

}