margin-bottom not working

Give the containing box position:relative; and give the links position:absolute; bottom:10px; right:20px. See https://jsfiddle.net/Ltnmv/.

What does the “~” (tilde/squiggle/twiddle) CSS selector mean?

The ~ selector is in fact the General sibling combinator (renamed to Subsequent-sibling combinator in selectors Level 4): The general sibling combinator is made of the “tilde” (U+007E, ~) character that separates two sequences of simple selectors. The elements represented by the two sequences share the same parent in the document tree and the element represented by the first sequence … Read more

CSS not working in Chrome

Comparing css links between the page you referenced and sub-pages, you have a “media” attribute in your link: Problem: Working: Try removing the “media” attribute and it should work fine. More specifically, it does not appear that “only” is a valid operating for the media attribute. See this W3Schools page for details.

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