The web site content width is 100%. Anyway on changing web site resolution it shows scrollbar even when it is not needed. Probably need to do some changes in CSS.
Please help me to take off scrollbar when it is not needed by using CSS.

The web site you can look in site http://www.rutiassis.com/en/about.html

Printscreen of scroolbar problem:

The image you have on the left is 392px wide and you've set your menu to be 700px wide. As soon as the browser is under 1092px wide it's going to need a scrollbar. You'll probably want to lower the width of your menu.