CSS How to set div height 100% minus nPx

Question

I have a wrapper div which contans 2 divs next to each other. Above this container I have a div that contains my header. The wrapper div must be 100% minus the height of the

Answer 1

Use an outer wrapper div set to 100% and then your inner wrapper div 100% should be now relative to that.

I thought for sure this used to work for me, but apparently not:

  
Some text 

on the left
  
Some Text on the 

right