You can use Inspect element and change each section for yourself. For more information, please read the following article.
If you want to make changes to design then you can use Inspect Tool to see the source code of your website and the CSS rules applied to it.
To enable it right click and from the pop-up menu select Inspect Element
For more details please visit Chrome inspect element or Firefox inspect element. Meanwhile searching on google for it will be helpful.
For example, we try to change bottom gray border color in a footer. You can watch the tutorial video here: