the page heading isn't connected

please help me with the website heading here. Please look at my picture below:

I have no idea why it is like that. I just use simple css and it became like that and similar 开发者_开发技巧as the buttom. The same thing happens as the bottom part of the page. Please help!Not sure why it's like that.

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Try adding the following CSS to override default padding.

html,body{padding:0;}