三角符合

.toggle-up{
    position: relative;
    top: 0!important;
    right: 0!important;
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid #fff;
    border-bottom: 0;
    display: inline-block;
    margin-left: 4px;
}

.toggle-down {
    position: relative;
    top: 0!important;
    right: 0!important;
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid #fff;
    border-bottom: 0;
    display: inline-block;
    margin-left: 4px;
}