There appears to be an overflow issue with the search form in the side nav. I found that the offending rule is a left padding on the text input, which causes the total width of the input to be 270px, 30px wider than the parent container. Screenshot of the issue: http://imgur.com/a/4Kw1y Based on my brief testing, I believe the fix is fairly straightforward. In _side-nav.scss, at line 143, add a new rule to the input[type=text] block so it looks like so:

input[type=text] {
    border-bottom: 1px solid #fff;
    font-weight: 300;
    padding-left: 30px;
    width: calc(100% - 30px);
}

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