#app {
    position: relative;
}

.content {
    position: static;
    margin-top: 56px; /* navbar height */
    margin-left: 200px; /* sidebar width */
}

.sidebar {
    position: fixed;
    top: 56px; /* navbar height */
    bottom: 0;
    left: 0;
    width: 200px;
    z-index: 100;
    padding: 10px;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
    overflow-y: auto;
}