<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>盒模型</title></head><body> <div class="box"> </div> <style> .box { width: 200px; height: 250px; background-color: violet; /* border: 10px dashed currentColor; */ background-clip: content-box; /* 顺时针方向 */ /* padding:5px 10px 15px 20px; */ /* padding:5px 10px 20px; */ /* padding:5px 20px; */ padding:5px; /* 改变盒子的计算方式，使得宽高就是设定的,不会破坏布局 */ box-sizing: border-box; /* 边框设置 */ /* border-top-width: 20px; border-top-style: solid; border-top-color:red; */ border: 5px solid red; } *{ padding: 0; margin: 0; box-sizing: border-box; } </style></body></html>
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