body {
    background-color: #f1f1f1;
}
body .y-container {
    background-color: #fff;
    padding-bottom: 1rem;
}
.y-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0,0,0,.2);
    margin-right: calc(-1rem + 1px);
    margin-bottom: 1rem;
    margin-left: calc(-1rem + 1px);
}
.y-header .nav-item.active {
    border-bottom: 3px solid #000;
    margin-bottom: -0.5rem;
}
.y-sidebar {
    background-color: #222326;
    margin-bottom: -1rem;
    padding: 0;
}
.y-sidebar .list-group-item {
    background-color: transparent;
    border: none;
    border-radius: 0;
    color: #fff;
}
.y-sidebar .list-group-item:before {
    background-color: transparent;
    content: '';
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    width: 4px;
}
.y-sidebar .list-group-item.active:before {
    background-color: #fff;
}