W3.CSS - 响应式设计

W3.CSS 有几个特殊的类来创建响应式设计。

先生。没有。 类名和描述
1

w3-半

将容器设置为在中型或大屏幕设备上占据窗口的 1/2。如果屏幕小于 601 像素，则会将容器大小调整为 100%。
2

w3-第三

将容器设置为在中型或大屏幕设备上占据窗口的1/3 。如果屏幕小于 601 像素，则会将容器大小调整为 100%。
3

第三季度

将容器设置为在中型或大屏幕设备上占据窗口的1/4 。如果屏幕小于 601 像素，则会将容器大小调整为 100%。
4

w3-列

指定 12 列网格中的一列。
5

w3行

指定用于响应类的无填充容器。为了使响应类完全响应，该类是必需的。

例子

w3css_responsive_design.htm

现场演示 
<html>
   <head>
      <title>The W3.CSS Containers</title>
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <link rel = "stylesheet" href = "https://www.w3schools.com/lib/w3.css">
   </head>
   
   <body>
      <header class = "w3-container w3-teal">
         <h2>Mobile First Design Demo</h2>
         <p class = "w3-large">Resize the window to see the effect!</p>
      </header>
      <br/>
      
      <div class = "w3-row w3-border">
         <div class = "w3-container w3-half w3-red">
            <h2>w3-half</h2>
            <p>Sets the container to occupy 1/2<sup>nd</sup> of the window on medium or large screen devices. If a screen is smaller than 601 pixels then it resizes the container to 100%.</p>
         </div>
         
         <div class = "w3-container w3-half">
            <h2>w3-half</h2>
         </div>
      </div>
      <br/>
      
      <div class = "w3-row w3-border">
         <div class = "w3-container w3-third w3-red">
            <h2>w3-third</h2>
            <p>Sets the container to occupy 1/3<sup>rd</sup> of the window on medium or large screen devices. If a screen is smaller than 601 pixels then it resizes the container to 100%.</p>
         </div>
         
         <div class = "w3-container w3-third">
            <h2>w3-third</h2>
         </div>
      </div>
      <br/>
      
      <div class = "w3-row w3-border">
         <div class = "w3-container w3-quarter w3-red">
            <h2>w3-quarter</h2>
            <p>Sets the container to occupy 1/4<sup>th</sup> of the window on medium or large screen devices. If a screen is smaller than 601 pixels then it resizes the container to 100%.</p>
         </div>

         <div class = "w3-container w3-quarter">
            <h2>w3-quarter</h2>
         </div>
      </div>
   </body>
</html>

结果

验证结果。