Fluid sticky footer with flex

Question

I am trying to make footer at the bootom with flex as described in this question How to make a fluid sticky footer

the answer with adding to the body

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Answer 1

Try using a flex container on the #mainDiv with justify-content: space-between.

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: orange;
  margin: 0;
}

#mainDiv {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

  
 This is header 
  

    
 This is content 
    
 This is footer