Teach you the small triangle, for mobile, etc., to address the default style of mobile a tags

1. The small triangle, by giving a div a large enough border, let it's top border, right border, left border, the background color is set to transparent, to achieve, as follows:

<! DOCTYPE html>
Mobile problems with 2.a tags:
1 "When you click on the a tag, it will have the default background color, the solution
 1 -webkit-tap-highlight-color:transparent;
2. When you click, the underline may appear, the workaround
　　　　
1 // or 2 3          Border:none;// or 45          Outline:none;
3> when the mouse is put on the underline, the solution;
　　
a:hover{    Text-decoration:none;}
A tag is an inline label, and if you want to set its width height or multiple styles to pass Display:block, change it to a block-level label.
　　　　
Teach you the small triangle, for mobile, etc., to address the default style of mobile a tags