CSS Flexbox: Use the flex-grow Property to Expand Items

Use the flex-grow Property to Expand Items

The opposite of flex-shrink is the flex-grow property. Recall that flex-shrink controls the size of the items when the container shrinks. The flex-grow property controls the size of items when the parent container expands.

if one item has a flex-grow value of 1 and the other has a flex-grow value of 3, the one with the value of 3 will grow three times as much as the other.

consider this flex-box containing two boxes  box1  and box2 that they do not have width property set .
i add text inside them so they will appear as text wide only.

box1
box2
html code here

<style>
  #box-container {
    display: flex;
    height: 300px;
  }
  
  #box-1 {
    background-color: dodgerblue;
    height: 200px;
    
    
  }
  
  #box-2 {
    background-color: orangered;
    height: 200px;
   }
</style>

<div id="box-container">
  <div id="box-1"></div>
  <div id="box-2"></div>
</div>

now let's use flex-grow in these boxes by adding flex-grow:1 for box1 and flex-grow:2 for box2  and see the result


box1
box2

<style>
  #box-container {
    display: flex;
    height: 300px;
  }
  
  #box-1 {
    background-color: dodgerblue;
    height: 200px;
    flex-grow:1;
    
  }
  
  #box-2 {
    background-color: orangered;
    height: 200px;
    flex-grow:2;
  }
</style>

<div id="box-container">
  <div id="box-1"></div>
  <div id="box-2"></div>
</div>

source

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