It looks clean to me; the only minor problem I noticed was that the Facebook, Reddit, and Twitter buttons don’t link anywhere and the last button of the 3 you push will stay pushed in until you click somewhere else on the page.
This solves your button problem. I’m hiding it so you can choose to spot it yourself if you so wish. I like the page. Looks good, and I’m feeling the Bern!
There was no <a> element, as you’d placed the href within the button element. Place the <a> element nested inside the button, and the button will work but not look right. Outside like this, it works and looks as it should.[/details]