First sorry for my english, I´ll try to tell what is my problem, I am trying to install many themes which are width 100% but when installed on my wordpress they are not 100%, the margin left and right is big and the theme is in the center and all small.
I thought it was a theme problem so I tryed with others themes but the same problem happened. I tryed installing another version of wordpress and the same problem happened. I will attach 2 screenshots, one with a demo theme with the width normal, and the other screenshot is the same theme installed on my wordpress. PLEASE HELP!!!!