console 命令行工具 X clear

console

<div></div>

<div class="box"><p>123</p></div>

div{
  width:300px;
  height:300px;
  background:red;
  padding:10px;
  border:5px solid #000;
  box-sizing:border-box; /* pading border 不占位 */
}

p { color:green!important; /* 优先级高 */}
.box p { color:#fff;}