W3.CSS - Responsive Design

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W3.CSS has several special classes to create a responsive design.

Sr. No. Class Name & Description
1

w3-half

Sets the container to occupy 1/2nd of the window on medium or large screen devices. If a screen is smaller than 601 pixels, then it resizes the container to 100%.
2

w3-third

Sets the container to occupy 1/3rd of the window on medium or large screen devices. If a screen is smaller than 601 pixels, then it resizes the container to 100%.
3

w3-quarter

Sets the container to occupy 1/4th of the window on medium or large screen devices. If a screen is smaller than 601 pixels, then it resizes the container to 100%.
4

w3-col

Specifies a column in a 12 column grid.
5

w3-row

Specifies a padding-less container to be used for responsive classes. This class is mandatory for responsive classes to be fully responsive.

Example

w3css_responsive_design.htm

Live Demo 
<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>

Result

Verify the result.

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