使用字体颜色修改水平规则使它们更加灵活和易于使用。

color属性在默认情况下是不继承的，因此需要将以下属性添加到hr's中以允许颜色继承:

/*允许hr继承颜色*/ Hr{边框:1px solid;} /*可重复使用的颜色修饰符*/ .fc_-alpha{颜色:深红色;} 正常的人力资源: <人力资源> Hr与<span class="fc_-alpha">颜色修饰符</span>: <人力资源类= " fc_-alpha " >

我认为你应该使用border-color而不是color，如果你的意图是改变<hr>标签产生的线条的颜色。

尽管如此，评论中已经指出，如果你改变了线条的大小，边框仍然会和你在样式中指定的一样宽，并且线条将被默认的颜色填充(这在大多数情况下不是理想的效果)。所以在这种情况下，你似乎还需要指定background-color(就像@Ibu在他的回答中建议的那样)。

HTML 5样板项目在其默认样式表中指定了以下规则:

hr { display: block; height: 1px;
    border: 0; border-top: 1px solid #ccc;
    margin: 1em 0; padding: 0; }

SitePoint最近发表了一篇名为“12个鲜为人知的CSS事实”的文章，提到<hr>可以将它的border-color设置为它的父颜色，如果你指定了hr {border-color: inherit}。

我认为这是最有效的方法:

<hr style="border-top: 1px solid #ccc; background: transparent;">

或者如果你喜欢在所有的hr元素上写这个CSS:

hr {
  background-color: transparent;
  border-top: 1px solid #ccc;
}

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/

你可以这样做:

人力资源{ 边框:1px纯红色; ｝ <人力资源/ > 这是个测试 <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" />