Click on the url at the top of your screen and add "view-source:" without the quotes before the "https://" as seen in the image below.
Source Code
If you're interested in poking around the source code of this site, simply select the type of device you are currently on and follow the steps indicated.
PC/Mac
Begin by right-clicking anywhere on the page and you'll see a menu like the one shown here.
Simply click on the button that says "view page source" and you'll be brought to the source code page.