Update select.css
Update select.css

修改为```var(--index-normal)```
Kingwl/element,Leopoldthecoder/element-1,immissile/m-element,ElemeFE/element,iamnewsea/element-pzx,iamnewsea/element-pzx,renxia/element,Raganof/element,Kingwl/element,huguangju/element,baiyaaaaa/element,ElemeFE/element,baiyaaaaa/element,huguangju/element,renxia/element,Raganof/element,Leopoldthecoder/element-1,JavascriptTips/element,immissile/m-element,JavascriptTips/element