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HomeWeb Front-endCSS TutorialHow to implement the close button in CSS3

实现关闭按钮方法:1、创建一个标签;2、使用“标签id名::before {content: "\2716";}”属性,将按钮设置成叉按钮;3、使用“position: absolute;”配合上下左右进行定位,放置到指定位置。

How to implement the close button in CSS3

本教程操作环境:windows7系统、CSS3&&HTML5版、Dell G3电脑。

在本文中将分享用CSS3设计出来的样式来呈现出关闭按钮的样子,这样以后想设计简单的对话框,就不需要求美工来帮忙画按钮的图片了。先来看看样式:

/* basic style */
.close {    /* still bad on picking color */
    background: orange;    
    color: red;    /* make a round button */
    border-radius: 12px;    /* center text */
    line-height: 20px;    
    text-align: center;    
    height: 20px;    
    width: 20px;    
    font-size: 18px;    
    padding: 1px;
    }/* use cross as close button */
.close::before {    
    content: "\2716";
    }
    /* place the button on top-right */
.close {    
    top: -10px;    
    right: -10px;    
    position: absolute;
    }

然后直接把它加到HTML元素上就可以看到效果了:

<div style="height: 100px; width: 100px; border: 1px solid black; position: relative;">
    <span class="close"></span>
</div>

效果:

How to implement the close button in CSS3

这主要是利用了在CSS的::before伪属性可以直接添加内容的特点,这样就可以直接设置样式在class上而不用做其它操作。当然这里用::after效果也是一样的。唯一要注意的是如果要指定关闭按钮在特定位置,就需要使用到position:absolut;,相应的其父元素就不能是默认的position:static;。

对于按钮中的叉按钮,用的是Unicode中的一种标识,以下这些也可以使用:

How to implement the close button in CSS3 

只是使用了不同字符后,可能居中位置会有偏差需要重新调整。

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