SOURCE

<div id="box1">
        <div id="text">学习CSS很重要</div>
    </div>
    <div id="box2">盒子模型需要认真理解</div>

body{
    margin:0;
    padding:0;
  }
    #box1{
      background-color:#9cf;
      margin;20px;
      border:10px solid #039;
      padding:40px;
      width:200px;
    }
    
    #text{
      background-color:#fc0;
      height:100px;
    }
    
    #box2{
      background-color:#ccc;
      margin:5px;
      height:100px;
      padding-left:30px;
    }