Css ID 在媒体查询中不会改变

Question

我的媒体查询没有正确更新。这是测试 html:

 <!DOCTYPE HTML>

<html>
    <head>
        <link rel="stylesheet" type="text/css" href="main.css">
        <title>Test </title>
    </head>
    <body>
        <div class="row">
            <div id="verde" class="col-5">
                <h2>Lorem Site</h2>
                <h3>Test Site</h3>
            </div>
        </div>
        <div class="row">
<div class="col-12">
    <p>Bacon ipsum dolor sit amet pastrami ribeye sausage, sirloin short ribs pork belly strip steak tenderloin boudin. Landjaeger beef ham hock, doner bacon pork belly filet mignon tenderloin short loin beef ribs tongue. Bresaola salami short ribs venison, pastrami jerky landjaeger. Hamburger meatball cow pork loin ham. Sirloin tail venison jerky kevin. Turducken ribeye sirloin fatback tenderloin short loin. Boudin sirloin tail venison filet mignon rump leberkas landjaeger bacon shank beef ribs ground round. Tail boudin landjaeger rump, chuck shankle leberkas pork belly pork tongue brisket short ribs ground round. Strip steak jowl pork loin beef ribs, ribeye tail spare ribs rump</p>
</div>
        </div>
        <div class="row">

<div id="verde" class="col-4">
                <p> Col 4Bacon ipsum dolor sit amet pastrami ribeye sausage, sirloin short ribs pork belly strip steak tenderloin boudin. Landjaeger beef ham hock, doner bacon pork belly filet mignon tenderloin short loin beef ribs tongue. Bresaola salami short ribs venison, pastrami jerky landjaeger. Hamburger meatball cow pork loin ham. Sirloin tail venison jerky kevin. Turducken ribeye sirloin fatback tenderloin short loin. Boudin sirloin tail venison filet mignon rump leberkas landjaeger bacon shank beef ribs ground round. Tail boudin landjaeger rump, chuck shankle leberkas pork belly pork tongue brisket short ribs ground round. Strip steak jowl pork loin beef ribs, ribeye tail spare ribs rump</p>
            </div>
            <div id="verde" class="col-4">
                <p>Bacon ipsum dolor sit amet pastrami ribeye sausage, sirloin short ribs pork belly strip steak tenderloin boudin. Landjaeger beef ham hock, doner bacon pork belly filet mignon tenderloin short loin beef ribs tongue. Bresaola salami short ribs venison, pastrami jerky landjaeger. Hamburger meatball cow pork loin ham. Sirloin tail venison jerky kevin. Turducken ribeye sirloin fatback tenderloin short loin. Boudin sirloin tail venison filet mignon rump leberkas landjaeger bacon shank beef ribs ground round. Tail boudin landjaeger rump, chuck shankle leberkas pork belly pork tongue brisket short ribs ground round. Strip steak jowl pork loin beef ribs, ribeye tail spare ribs rump</p>
            </div>
            <div class="col-4">cOL4
                <p>Bacon ipsum dolor sit amet pastrami ribeye sausage, sirloin short ribs pork belly strip steak tenderloin boudin. Landjaeger beef ham hock, doner bacon pork belly filet mignon tenderloin short loin beef ribs tongue. Bresaola salami short ribs venison, pastrami jerky landjaeger. Hamburger meatball cow pork loin ham. Sirloin tail venison jerky kevin. Turducken ribeye sirloin fatback tenderloin short loin. Boudin sirloin tail venison filet mignon rump leberkas landjaeger bacon shank beef ribs ground round. Tail boudin landjaeger rump, chuck shankle leberkas pork belly pork tongue brisket short ribs ground round. Strip steak jowl pork loin beef ribs, ribeye tail spare ribs rump</p>
            </div>
        </div>
    </body>

</html>

这是我的CSS

    @media screen and (max-width:760px){
     #verde{
        color:red;
    }
}
*{
    border: 1px solid red !important;
}
*{
    box-sizing:border-box;
}

p {
    margin: 10px;
}
#verde{
    color:green;
}
.row{
    width: 100%;
    margin:auto;
    display: flex;
    flex-wrap:wrap;
}
.col-1{
    width: 8.33%;
}
.col-2{
    width: 16.66%;
}
.col-3{
    width: 25%;
}
.col-4{
    width: 33.33%;

}
.col-5{
    width: 41.66%;
    margin-left:auto;
}
.col-6{
    width: 50%;
}
.col-7{
    width: 58.33%;
}
.col-8{
    width: 66.66%;
}
.col-9{
    width: 75%;
}
.col-10{
    width: 83.33%;
}
.col-11{
    width: 91.66%;
}
.col-12{
    width: 100%;
    margin-left:20%;
}

现在，我想在媒体查询中将 ID #verde 更改为红色。这种方法不起作用，只有当我更具体时它才有效，例如我使用

 body #verde

或者我指定 class 和 ID。问题是为什么只有当我更具体时它才有效？

提前致谢

Answer 1

您需要将媒体查询放在样式表的末尾，因为样式就是这样 "cascading"

目前你的媒体查询是第一位的，所以之后的任何不更具体的内容都会被覆盖。

...Everything before...

 @media screen and (max-width:760px){
     #verde{
        color:red;
    }
}

Here's a JSFiddle where I rearranged your CSS.

Answer 2

问题是您将媒体查询放在 CSS 的开头，因此它被稍后出现在 CSS 中的 "generic" 样式覆盖。解决方案是将媒体查询移动到 CSS 的末尾，或者创建第二个媒体查询以在 window 宽度大于 760px 时设置样式 #verde。

Css ID 在媒体查询中不会改变

Css id's don't change on media queries

html

css

media-queries