下拉框 上下箭头css

.drop-down{
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 7px solid #E5BF42;
}

.drop-up{
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 7px solid #E5BF42;
}