The tags in the existing code are not indented for you. If you wish to have them indented, you can go into the code using the text editor and change the indentation for each page/post. You can also copy the code into a separate text editor and then make the indentations for the code there, then copy it back into the text editor. At present, even in a default WordPress installation, there is no automatic indentation of the code in text view nor any current plans to format existing code. I also verified this by looking at a default WordPress installation and viewing one of their sample pages.
If you have any further questions, please let us know.
I tried 2 things. First I tried setting the $content-width in the functions.php, but that did not work. Next I updated the css which did work although the background image does not follow the css. I tried using a smaller background image, but that just placed the image off the left.
margin: 0 auto !important;
float: none !important;
I don’t see a way to center the background image.
Instead of modifying the functions.php file to adjust/center the background image, I recommend using the Background tool in the Customizer. You can also use the Page/Post Editor in BoldGrid to change the width and size by dragging the sections.
If you want to modify/custom-code a theme, the details are covered in the BoldGrid Documentation. This information will primarily be useful for a developer or designer, as it assumes familiarity with HTML, CSS, PHP, etc.