使用媒体查询将CSS类设置为与BootStrap类相等 [英] Set CSS class equal BootStrap class with media query

问题描述

希望这是一个简单的CSS问题.我有以下BootStrap按钮，我希望将其缩小以适应较小的屏幕尺寸(请参见下文).本质上，我将类更改为"btn btn-default btn-xs "

Hoping this is a simple CSS question. I have the following BootStrap button which I want to make smaller for smaller screen sizes (see below). In essence I what to change the class to "btn btn-default btn-xs"

<button type="button" class="btn btn-default btn-sm" id="myButton" >
    <span class="glyphicon glyphicon-envelope"></span>
</button>

我假设我必须使用媒体查询.我可以通过使用ID选择器以某种方式将我的类设置为等于引导类吗? (请参见下面的伪代码)

I assume I have to use a media query. Can I somehow set my class to be equal to the bootstrap classes by using the ID selector? ( see pseudo code below )

@media only screen and (max-width: 450px) {

    #myButton {
        .btn .btn-default .btn-xs // Inject magic here
    }
}

谢谢

推荐答案

这是通过@media查询控制#myButton的CSS的方式.

Here is the way that you would control the css of #myButton via @media queries.

<button type="button" class="btn btn-default btn-sm" id="myButton" >
    <span class="glyphicon glyphicon-envelope"></span>
</button>

@media only screen and (max-width: 450px) {

    #myButton {
        font-size: 12px;
    }
}

@media only screen and (max-width: 768px) {

    #myButton {
           font-size: 16px; 
    }
}

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