fix header background (#1407)
fix header background (#1407)


immissile/m-element,Leopoldthecoder/element-1,engriary/element,pengchongfu/element,ElemeFE/element,Kingwl/element,immissile/m-element,JavascriptTips/element,hisland/element,imyzf/element,huguangju/element,renxia/element,hisland/element,Raganof/element,pengchongfu/element,youngerheart/element,Kingwl/element,baiyaaaaa/element,hetian9288/elui,baiyaaaaa/element,youngerheart/element,iamnewsea/element-pzx,karol-f/element,huguangju/element,karol-f/element,jsyczhanghao/element,renxia/element,ElemeFE/element,Raganof/element,Leopoldthecoder/element-1,iamnewsea/element-pzx,imyzf/element,engriary/element,JavascriptTips/element,reverland/element,reverland/element,hetian9288/elui