Why html page isn't fit to 100%?

Question

Whenever i want to make a html page i have problem with this, why html page is less than 100%? Let me explain in example:

Answer 1

It is because display:inline-block creates white-space in the html...

you could change the display:inline-block to float:left

see https://jsfiddle.net/z0cc6fp7/1/