本文介绍了CSS 边距推动 body 元素的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在为 div 元素设置边距，但是 body 元素也会获得该边距.
考虑这个代码:
<身体><div>这是结果和问题:
到目前为止，我已经通过向 body 元素添加 border:1px solid transparent; 属性解决了这个问题.这会破坏 100% 的高度，因为 1px 边框会出现滚动条.为什么会发生这种情况?
可能的解决方案(感谢您的帮助):添加一个 padding-top:1px 和一个 margin-top:-1px，这滚动条不会破坏 100% 的高度，并且您可以避免边距折叠.
这听起来与我遇到的问题相似:边距和负边距.我通过放置填充顶部而不是边框来解决我的问题，也许这对您的设计更有效?否则试试这个链接:http://www.seifi.org/css/understanding-taming-collapsing-margins-in-css.html
I'm setting a margin for a div element, however the body element also gets that margin.
Consider this code:
<!-- HTML -->
<body>
<div>
</div>
</body>
<!-- CSS -->
<style>
html,body {
height:100%;
margin:0;
padding:0;
outline:1px solid blue;
}
div {
margin:20px;
outline:1px solid red;
}
</style>
This is the result and the problem:
So far I've solved the problem by adding a border:1px solid transparent; property to the body element. This ruins the 100% height because scrollbars appear due to the 1px border. Why does this happen?
POSSIBLE SOLUTION (thanks for the help): Add a padding-top:1px and a margin-top:-1px, this way the 100% height doesn't gets ruined with the scrollbars and your are avoiding margin collapsing.
This sounds similar to a problem I had: Margins and negative margins. I solved mine by putting a padding-top rather than a border, maybe this works with your design slightly better? Otherwise try this link: http://www.seifi.org/css/understanding-taming-collapsing-margins-in-css.html
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