Remove useless var `button-paddding`
Remove useless var `button-paddding`

```css
   --button-paddding: 5px 20px; /* useless */
```
renxia/element,Raganof/element,JavascriptTips/element,reverland/element,pengchongfu/element,iamnewsea/element-pzx,jsyczhanghao/element,huguangju/element,huguangju/element,immissile/m-element,Leopoldthecoder/element-1,Kingwl/element,JavascriptTips/element,reverland/element,renxia/element,engriary/element,baiyaaaaa/element,engriary/element,Kingwl/element,immissile/m-element,ElemeFE/element,ElemeFE/element,Leopoldthecoder/element-1,Raganof/element,baiyaaaaa/element,pengchongfu/element,iamnewsea/element-pzx