.collapsible {
    border-top: 1px solid #ddd;
    border-right: 1px solid #ddd;
    border-left: 1px solid #ddd;
    margin: 0.5rem 0 1rem 0;
}

.collapsible-header {
    display: block;
    cursor: pointer;
    min-height: 3rem;
    line-height: 3rem;
    padding: 0 1rem;
    background-color: #2196f3;
    color: #fff;
    border-bottom: 1px solid #ddd;
}

    .collapsible-header i {
        width: 2rem;
        font-size: 1.6rem;
        line-height: 3rem;
        display: block;
        float: left;
        text-align: center;
        margin-right: 1rem;
    }

.collapsible-body {
    display: none;
    border-bottom: 1px solid #ddd;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

    .collapsible-body p {
        margin: 0;
        padding: 2rem;
    }

.side-nav .collapsible {
    border: none;
    box-shadow: none;
}

    .side-nav .collapsible li {
        padding: 0;
    }

.side-nav .collapsible-header {
    background-color: transparent;
    border: none;
    line-height: inherit;
    height: inherit;
    margin: 0 1rem;
}

    .side-nav .collapsible-header i {
        line-height: inherit;
    }

.side-nav .collapsible-body {
    border: 0;
    background-color: #fff;
}

    .side-nav .collapsible-body li a {
        margin: 0 1rem 0 2rem;
    }

.collapsible.popout {
    border: none;
    box-shadow: none;
}

    .collapsible.popout > li {
        box-shadow: 0 2px 5px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12);
        margin: 0 24px;
        transition: margin .35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

        .collapsible.popout > li.active {
            box-shadow: 0 5px 11px 0 rgba(0,0,0,0.18),0 4px 15px 0 rgba(0,0,0,0.15);
            margin: 16px 0;
        }