为什么内部DIV从外部DIV溢出? [英] Why does inner DIV spill out of outer DIV?

问题描述

我已经远离HTML和CSS，找不到这个简单问题的解决方案.

I have been long away from HTML and CSS, can't find the solution to this simple problem.

我的另一个内有一个div.外黑色和内橙色.

I have one div inside the other. Outer Black and inner orange.

我的HTML和CSS是:

My HTML and CSS is :

#outer {
  position: fixed;
  width: 30%;
  height: 30%;
  background-color: black;
}
#inner {
  width: 100%;
  height: 100%;
  margin: 5px;
  background-color: orange;
}

<div id="outer">
  <div id="inner">
  </div>
</div>

为什么我的内部DIV从外部溢出?如何在不提供固定尺寸的情况下进行修复?

Why is my inner DIV spilling out of the outer ? How do I fix it without giving fixed dimensions?

推荐答案

由于边距-宽度为100％加上边距.为了避免这种情况，请编写 width:calc(100％-10px); (=边距的两倍.)高度相同.

Because of the margin - the width is 100% PLUS the margin. To avoid that, write width: calc(100% - 10px); (= twice the margin.) Same for height.

#outer {
  position: fixed;
  width: 30%;
  height: 30%;
  background-color: black;
}
#inner {

  width: calc(100% - 10px);
  height: calc(100% - 10px);
  margin: 5px;
  background-color: orange;
}

<div id="outer">
  <div id="inner">
  </div>
</div>

这篇关于为什么内部DIV从外部DIV溢出?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！