How to center a control in HTML __html

Contact before the time is not long, try to use the control itself with CSS to center the control, but failed to find information on the Internet, found the idea, the control set the parent tag , and then set the center properties

Method 1 Sets the center parent tag, which is found only to center the control horizontally:

<! DOCTYPE html>  
  Method 1 sets the div parent tag and then sets the style align= "center" to test this method to implement:  
 

<! DOCTYPE html>