keep padding from making the element bigger?

Question

I have an element with a 70% width, and it is floating beside an element with 30% width, but when I add 25px of padding it expands the element and breaks the fo

Answer 1

I would create another element of the same type (may I guess it's a div?) inside the element and set that one to have a padding/margin of 25px.

For example:

 

 
 

  

   Acctual content here.