Full comprehension with a width of 100%

Here is an example where .flex2 has 2 children.

  • 1st child - width: 300px
  • 2nd child - width: 100%
.b{
  height: 50px;
}

.flex2{
  margin-top: 20px;
  display: flex;
  
  .box{
    background-color: blue;
    width: 300px;
  }
  
  .box1{
    background-color: purple;
    width: 100%;
  }
}
<div class="flex2">
  <div class="box b">
    box
  </div>
  
  <div class="box1 b">
    box 1
  </div>
</div>

Why does setting the width to 100% (2nd child) cause a slight compression of the 1st child block with a width of 300px?

I understand that percentage width depends on the parent block's width, but I'm still confused about this behavior.

Can someone explain why setting the width to 100% shifts the block only slightly?

Answer №1

By default, flex containers have a flex-shrink: 1 property that allows them to shrink proportionally to fit inside their parent container. To prevent the first child from shrinking and maintain a size of 300px, you can include flex-shrink: 0 in the styling for the first child. I trust this explanation is beneficial.

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