Two divs side by side - Fluid display

Question

I am trying to place two divs side by side and using the following CSS for it.

#left {
  float: left;
  width: 65%;
          


        

Answer 1

This is easy with a flexbox:

#wrapper {
  display: flex;
}

#left {
  flex: 0 0 65%;
}

#right {
  flex: 1;
}

  
Left side div
  
Right side div