Boxes or Padding? Can't find spaces in a template

I'm working with a template from HTML5up named "Read Only". I have inserted a video player into the code, but there is too much space between the banner and my player. With some help I found the following code in a style sheet:

 #main > section > .container {
padding: 4em 0 2em 0;
} 

When I changed  padding: 4em to a null value, it moved the player up, but there is still a big space between banner and player.

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