Newbies ask for advice on DIV CSS layout_html/css_WEB-ITnose

Newbie question, after using DIV CSS layout, there is always a gap in the head. Please tell me how to remove it, thank you.

Picture:

Reply to discussion (solution)

*{margin:0;padding:0;}

Problem solved, thank you very much! ! !

*{margin:0;padding:0;}