CSS Media Features

CSS Media Features - Width

CSS media feature width is used to determine the width (horizontal dimension) of the viewport (browser's viewing area).

The width media feature can also be used with the min-width and max-width properties to set the minimum and maximum width of the viewport.

Possible Values

<length> − The width of the viewport is represented by a specific length value, such as pixels (px) etc.

Syntax

@media (width: <length>){
   //CSS styles
}

CSS width - <length> Value

The following example demonstrates that the width media feature to change the background color to pink when the screen width is 200px −

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>
   
   <label id="labelWidth" for="height">Width: 100</label>
   <input id="width" name="width" type="range" min="100" max="300" step="5" value="100" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (width: 200px) { div { background: pink; } } </style><div>To see the effect resize your viewport's width is 200px.</div>">
   </iframe>
      
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };
      width.oninput = () => updateSize("width", labelWidth);
   </script>
</body>
</html>

CSS width - min-width Variant

The following example demonstrates that the min-width media feature to change the background color to red when the screen width is greater than or equal to 200px −

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>
   
   <label id="labelWidth" for="height">Width: 200</label>
   <input id="width" name="width" type="range" min="100" max="300" step="5" value="200" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (min-width: 200px) { div { background: red; } } </style><div>To see the effect resize your viewport's width.</div>">
   </iframe>
      
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };
      width.oninput = () => updateSize("width", labelWidth);
   </script>
</body>
</html>

CSS width - max-width Variant

The following example demonstrates that the max-width media feature to change the background color to pink when the screen width is less than or equal to 250px −

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>

   <label id="labelWidth" for="height">Width: 100</label>
   <input id="width" name="width" type="range" min="100" max="300" step="5" value="100" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (max-width: 250px) { div { background: pink; } } </style><div>To see the effect resize your viewport's width.</div>">
   </iframe>
      
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };
      width.oninput = () => updateSize("width", labelWidth);
   </script>
</body>
</html>