css remove the default style of a tag-Kaiqisan

A fairly low-creation article, but it is a very important knowledge point.

a {
    
    
	text-decoration: none; /* 去除默认的下划线 */
	outline: none;	/* 去除旧版浏览器的点击后的外虚线框 */
	color: #000;	/* 去除默认的颜色和点击后变化的颜色 */ 
}