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margin 简写属性在一个声明中设置所有外边距属性。该属性可以有 1 到 4 个值。


margin:10px 5px 15px 20px;

上外边距是 10px

右外边距是 5px

下外边距是 15px

左外边距是 20px




width:100px;

设置元素的宽度


做一个简单的登录页面

.bb{border:2px solid red ;width: 600px;margin: 150px auto}

.textcenter{text-align: center}

.full{width:100%}

div{line-height:40px}

    请输入用户名:

 

  

   

    请输入密   码:

 

 

   

 


效果


一个大的div包含3个小div

div{line-height:40px} div的行高为40px


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