.collapse-container{
    display: inline-block;
    position: relative;
}
.collapse-trigger{
    display: inline-block;
    width: 100%;
    position: relative;
}

.collapse-icon{
    position: absolute;
    right: 10px;
}

.collapse-content{
    height: 0; 
    overflow: hidden;
    transition: all .3s;
}

.collapse-content a{
    padding: 40px;
}

.collapse-show .collapse-content{
    height: auto;
    padding: 5px 0;
    overflow: visible;
}

.collapse-show .collapse-icon{
    transform: rotate(90deg);
}

.collapse-show .collapse-trigger{
    background-color: rgba(0, 0, 0, .15);
}