公用css
页面名：exercise_1.css
* {
margin: 0px;
padding: 0px;
}
.box {
/* 设置边框2px,实线，灰色*/
border: 2px solid gray;
/* 设置下边框不显示*/
border-bottom-style: none;
/*设置盒子宽高*/
width: 500px;
height: 300px;
/* 居中*/
margin: 0px auto;
}
/*外面大盒子*/
.ex-box {
/* 设置宽高*/
width: 1000px;
height: 500px;
/* 设置边框*/
border: 2px solid gray;
}
/*里面小盒子*/
.in-box1 {
/* 边框*/
border: 2px solid gray;
/* 宽度注意减去边框的宽度*/
width: 496px;
height: 300px;
/* 背景颜色*/
background-color: pink;
/* 向左浮动*/
float: left;
}
.in-box2 {
border: 2px solid gray;
width: 496px;
height: 300px;
background-color: pink;
float: left;
}
#in_box_padding1{
border: 2px solid gray;
/* 注意减去边框的宽度的同时减去padding的宽度,高度在这里减不减在效果上不明显*/
width: 486px;
height: 286px;
background-color: pink;
float: left;
/* 在盒子上方填充10px 左边填充10px*/
padding-top: 10px;
padding-left: 10px;
}
#in_box_padding2{
border: 2px solid gray;
width: 476px;
height: 276px;
background-color: pink;
float: left;
/* 在盒子上方填充20px 左边填充20px*/
padding-top: 20px;
padding-left: 20px;
}
练习1
文件名：exercise.html
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="exercise_1.css">
<title>盒子练习1</title>
</head>
<body>
<div class="box">
这是随便写点内容
</div>
</body>
</html>
练习2
页面名：boxinbox.html
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="exercise_1.css">
<title>盒子嵌套</title>
</head>
<body>
<div class="ex-box">外面的盒子
<br>
<div class="in-box1">内嵌盒子1</div>
<div class="in-box2">内嵌盒子2</div>
</div>
</body>
</html>
练习3
页面名：box_padding.html
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="exercise_1.css">
<title>盒子中padding的运用</title>
</head>
<body>
<div class="ex-box">
<div id="in_box_padding1">这里随便写点内容</div>
<div id="in_box_padding2">这里随便写点内容</div>
</div>
</body>
</html>
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