Flexbox - Flexibility

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flex-basis

We use the flex-basis property to define the default size of the flex-item before the space is distributed.

The following example demonstrates the usage of the flex-basis property. Here we are creating 3 colored boxes and fixing their size to 150 px.

Live Demo 
<!doctype html>
<html lang = "en">
   <style>
      .box{
         font-size:15px;
         padding:15px;
      }
      .box1{background:green; flex-basis:150px; }
      .box2{background:blue; flex-basis:150px;}
      .box3{background:red; flex-basis:150px;}
      
      .container{
         display:flex;
         height:100vh;
         align-items:flex-start;
      }
   </style>
   
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
      </div>
   </body>
</html>

It will produce the following result −

flex-grow

We use the flex-grow property to set the flex-grow factor. In case of excess space in the container, it specifies how much a particular flex-item should grow.

Live Demo 
<!doctype html>
<html lang = "en">
   <style>
      .box{
         font-size:15px;
         padding:15px;
      }
      .box1{background:green; flex-grow:10; flex-basis:100px; }
      .box2{background:blue; flex-grow:1; flex-basis:100px; }
      .box3{background:red; flex-grow:1; flex-basis:100px; }
      
      .container{
         display:flex;
         height:100vh;
         align-items:flex-start;
      }
   </style>
   
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
      </div>
   </body>
</html>

It will produce the following result −

flex-shrink

We use the flex-shrink property is used to set the flex shrink-factor. In case there is not enough space in the container, it specifies how much a flex-item should shrink.

Live Demo 
<!doctype html>
<html lang = "en">
   <style>
      .box{
         font-size:15px;
         padding:15px;
      }
      .box1{background:green; flex-basis:200px; flex-shrink:10}
      .box2{background:blue; flex-basis:200px; flex-shrink:1}
      .box3{background:red; flex-basis:200px; flex-shrink:1}
      
      .container{
         display:flex;
         height:100vh;
         align-items:flex-start;
      }
   </style>
   
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
      </div>
   </body>
</html>

It will produce the following result −

flex

There is a shorthand to set values to all these three properties at once; it is called flex. Using this property, you can set values to flex-grow, flex-shrink, and flex-basis values at once. Here is the syntax of this property.

.item {
   flex: none | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ]
}
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