Reduce white space around navigation bar in pages located in Bedford folders

Site URL: https://www.foodsafetyguides.com/example

There is a large amount of white space between (a) the navigation bar and window perimeter and (b) the navigation bar and main content in pages located in a folder in the Bedford template, so much that the template squeezes the content to the point I can't see everything when I embed files and have to scroll back and forth left to right (see screenshot). I know I could try to re-size the embedded file, but I like it's size. What I'd prefer to do is reduce the white space to make more room for main content. I tried reducing padding, but that just increased/reduced padding between navigation and edge of window. Thanks for your help!

Add to Home > Design > Custom CSS

/* reduce spacing betweens content - navigation */
main#page {
    padding-top: 20px;
}
/* resize iframe */
main#page {
    max-width: 100%;
}