万能清除:
父元素选择符:after{content:“内容”;clear:“both”;display:block;
height:0;overflow:hidden;visibility:hidden;}
visibility:hidden隐藏/visible可见(隐藏后仍占据·空间)
万能清除:
父元素选择符:after{content:“内容”;clear:“both”;display:block;
height:0;overflow:hidden;visibility:hidden;}
visibility:hidden隐藏/visible可见(隐藏后仍占据·空间)