一般来说，你不能像设置其他颜色一样，用CSS设置水平线的颜色。 首先，Internet Explorer需要CSS中的颜色读起来像这样:

“颜色:# 123455”

但是Opera和Mozilla需要你的CSS中的颜色读起来像这样:

background - color: # 123455”

因此，您需要将这两个选项添加到您的CSS中。

接下来，你需要给水平线一些尺寸，否则它将默认为浏览器设置的标准高度、宽度和颜色。 下面是一个示例代码，说明了你的CSS应该是什么样的，才能得到蓝色的水平线。

hr {
border: 0;
width: 100%;
color: #123455;
background-color: #123455;
height: 5px;
}

或者当你插入一条水平线时，你可以直接在你的HTML页面中添加样式，就像这样:

<hr style="background:#123455" />

希望这能有所帮助。

如果你使用CSS类，那么它将被所有的'hr'标签，但如果你想要一个特定的'hr'使用下面的代码，即内联CSS

<hr style="color:#99CC99" />

如果它不工作在chrome尝试以下代码:

<hr color="red" />

我两边都打了个赌:

hr {
  border-top: 1px solid purple;
  border-color: purple;
  background-color: purple;
  color: purple;
}

因为我没有声誉来评论，我将在这里给出一些想法。

如果你想要一个可变高度的CSS，去掉所有的边框，并给出一个背景色。

    hr{
        height:2px;
        border:0px;
        background:green;
        margin:0px;/*sometimes useful*/
    }
    /*Doesn't work in ie7 and below and in Quirks Mode*/

if you want simply a style that you know that will work (example: to replace a border in a ::before element for most email clients or hr{ height:0px; border:0px; border-top:2px solid blue; margin:0px;/*useful sometimes*/ } In both ways, if you set a width, it will always have it's size. No need to set display:block; for this. To be totally safe, you can mix both, 'cause some browsers can get confused with height:0px;: hr{ height:1px; border:0px; background:blue; border-top:1px solid blue; margin:0px;/*useful sometimes*/ } With this method you can be sure that it will have at least 2px in height. It's a line more, but safety is safety. This is the method you should use to be compatible with almost everything. Remember: Gmail only detects inline css and some email clients may not support backgrounds or borders. If one fails, you will still have a 1px line. Better than nothing. In the worst cases, you can try to add color:blue;. In the worst of the worst cases, you can try to use a <font color="blue"></font> tag and put your precious <hr/> tag inside it. It will inherit the <font></font> tag color. With this method, you WILL want to do like this: <hr width="50" align="left"/>. Example: <span> awhieugfrafgtgtfhjjygfjyjg <font color="#42B3E5"><hr width="50" align="left"/></font> </span> <!--Doesn't work in ie7 and below and in Quirks Mode--> Here is a link for you to check: http://jsfiddle.net/sna2D/

你应该设置border-width为0;它在火狐和Chrome浏览器上运行良好。

人力资源{ 明确:; 颜色:红色; 背景颜色:红色; 身高:1 px; 边框宽度:0; ｝ <人力资源/ > 这是一个测试 <人力资源/ >

我在2015年5月的IE, Firefox和Chrome上进行测试，这在当前版本中效果最好。它将HR居中，并使其70%宽:

人力资源。光{ 宽度:70%; 保证金:0汽车; 边框:0px无白色; Border-top:1px纯浅灰色; ｝ <hr class="light" />