Cannot click on Buttons after modifying CSS

I am having strange problem.

When I change the margin to 250px I cannot click on the buttons! I have to move the mouse to right of the button to click on it.

body.two-sidebars #squeeze {
/* margin: 0 270px; */
margin: 0 250px;
/* margin-left: 200px;*/
}

Actually I want to increase the width of the content in the center.