---
title: padding-bottom
slug: Web/CSS/padding-bottom
tags:
  - CSS
  - CSS 内边距
  - CSS 属性
translation_of: Web/CSS/padding-bottom
---
<div>{{CSSRef}}</div>

<p>CSS属性 <strong>padding-bottom</strong> 是指一个元素在内边距区域（padding area）中下方的高度。内边距（padding）是指一个元素的内容和边框之间的区域。和外边距（margin）不同，内边距（padding）是不允许有负值的。内边距（padding）可以用四个值声明一个元素的四个方向的内边距（paddings），这是一种CSS缩写属性。</p>

<p><img alt="The effect of the CSS padding-bottom property on the element box" src="/files/4109/padding-bottom.svg" style="border-style: solid; border-width: 1px; display: block; margin: 0px auto;"></p>

<pre class="brush:css no-line-numbers">/* &lt;length&gt; values */
padding-bottom: 0.5em;
padding-bottom: 0;
padding-bottom: 2cm;

/* &lt;percentage&gt; value */
padding-bottom: 10%;

/* Global values */
padding-bottom: inherit;
padding-bottom: initial;
padding-bottom: unset;
</pre>

<p>{{cssinfo}}</p>

<h2 id="Syntax">Syntax</h2>

<h3 id="Values">Values</h3>

<dl>
 <dt>{{cssxref("length")}}</dt>
 <dd>当内边距（padding）大小是一个固定单位数值的时候，一定不能为负数。</dd>
 <dt> </dt>
 <dt>{{cssxref("percentage")}}</dt>
 <dd>当内边距（padding）是一个百分比的时候， 百分比是和本身包含的元素的宽度有关的，同样一定不能为负数。</dd>
</dl>

<h3 id="Formal_syntax">Formal syntax</h3>

{{csssyntax}}

<h2 id="Examples">Examples</h2>

<pre class="eval">.content { padding-bottom: 5%; }
.sidebox { padding-bottom: 10px; }
</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{ SpecName('CSS3 Box', '#the-padding', 'padding-bottom') }}</td>
   <td>{{ Spec2('CSS3 Box') }}</td>
   <td>No change from {{ SpecName('CSS2.1', 'box.html#padding-properties', 'padding-bottom') }}.</td>
  </tr>
  <tr>
   <td>{{ SpecName('CSS3 Transitions', '#animatable-css', 'padding-bottom') }}</td>
   <td>{{ Spec2('CSS3 Transitions') }}</td>
   <td>Defines <code>padding-bottom</code> as animatable.</td>
  </tr>
  <tr>
   <td>{{ SpecName('CSS2.1', 'box.html#padding-properties', 'padding-bottom') }}</td>
   <td>{{ Spec2('CSS2.1') }}</td>
   <td>No change from {{ Specname('CSS1', '#padding-bottom', 'padding-bottom') }}.</td>
  </tr>
  <tr>
   <td>{{ Specname('CSS1', '#padding-bottom', 'padding-bottom') }}</td>
   <td>{{ Spec2('CSS1') }}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>1.0</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>1.0 (1.0)</td>
   <td>4.0</td>
   <td>3.5</td>
   <td>1.0 (85)</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{ CompatUnknown() }}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{ CompatUnknown() }}</td>
   <td>{{ CompatUnknown() }}</td>
   <td>{{ CompatUnknown() }}</td>
   <td>{{ CompatUnknown() }}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li><a class="internal" href="/en/CSS/box_model" title="en/CSS/box model">CSS Box Model</a></li>
 <li>The {{cssxref("padding")}} shorthand property can be used to set paddings on all four sides of an element with a single declaration: {{cssxref("padding-top")}}, {{cssxref("padding-right")}}, <code>padding-bottom</code>, and {{cssxref("padding-left")}}.</li>
</ul>