How to make flexbox children 100% height of their parent using CSS?

CSS Flexbox is an awesome tool to create website layouts. Making a flex-box child 100% height of their parent can be done in two ways. It is little tricky because, certainly it will display an error.
For example, the child may flow out of the parent boundary or it may not get upto 100% height that you will see in your browser output.

Example 1: This example makes a child flex-box of height 100% using CSS.

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<!DOCTYPE html>
<html>
   <head>
      <title>
          Make flex-box child height 100%
      </title>
        
      <style>
         * {
             padding: 0;
             margin: 0;
         }
         .container {
             width: 100vw;
             height: 50vh;
             background-color: green;
             display: flex;
             justify-content: center;
             align-items: center;
         }
         .child-div {
             height: 100%;
             background-color: red;
             margin: 0 20px;
         }
      </style>
   </head>
     
   <body>
      <div class="container">
         <div class="child-div">
            One
         </div>
         <div class="child-div">
            Two
         </div>
         <div class="child-div">
            Three
         </div>
         <div class="child-div">
            Four
         </div>
         <div class="child-div">
            Five
         </div>
      </div>
   </body>
</html>

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Output:




Example 2: The second way to achieve this by using align-items property in the parent div to ‘strech’. It makes every .child-div 100% height of it’s parent height.











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<!DOCTYPE html> 


<html> 


   <head> 


      <title> 


          Make flex-box child height 100% 


      </title> 


        


      <style> 


         *{ 


             padding: 0; 


             margin: 0; 


         } 


         .container{ 


             width: 100vw; 


             height: 50vh; 


             background-color: green; 


             display: flex; 


             justify-content: center; 


             align-items: stretch; 


         } 


         .child-div{ 


             background-color: red; 


             margin: 0 20px; 


         } 


      </style> 


   </head> 


     


   <body> 


      <div class="container"> 


         <div class="child-div"> 


            One 


         </div> 


         <div class="child-div"> 


            Two 


         </div> 


         <div class="child-div"> 


            Three 


         </div> 


         <div class="child-div"> 


            Four 


         </div> 


         <div class="child-div"> 


            Five 


         </div> 


      </div> 


   </body> 


</html> 



















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Output:




Example 3: This example makes width of child to 100% of there parent.











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<!DOCTYPE html> 


<html> 


   <head> 


      <title> 


          Make flex-box child width 100% 


      </title> 


        


      <style> 


         * { 


             padding: 0; 


             margin: 0; 


         } 


         .container { 


             width: 100vw; 


             height: 50vh; 


             background-color: green; 


             display: flex; 


             flex-direction: column; 


             justify-content: center; 


             align-items: stretch; 


         } 


         .child-div { 


             background-color: red; 


             margin: 20px 0; 


             padding: 5px; 


         } 


      </style> 


   </head> 


     


   <body> 


      <div class="container"> 


         <div class="child-div"> 


            One 


         </div> 


         <div class="child-div"> 


            Two 


         </div> 


         <div class="child-div"> 


            Three 


         </div> 


         <div class="child-div"> 


            Four 


         </div> 


         <div class="child-div"> 


            Five 


         </div> 


      </div> 


   </body> 


</html> 



















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Output:





          
          
          
          

            

    

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