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https://photographers.d3photography.com/css/jail.css

• #school_list { width: 400px; left: 20%; margin: 0 auto; top: 25%; position: absolute; z-index: 9999999; background-color: #fff; height: 550px; overflow: auto; font-size: 1.5em; padding: 2em; border: 1px solid black; } -- this is duplicated on Lines 250 and 43; may just be because of length of line and the code copied in media query tag
• A '/' follows the end of the line at line 46 and again later for the same tag; may just be because of length of line and the code copied in media query tag
• Line 71 for .functions div.items img, my analyzer is showing an issue with the padding portion. Replacing with: "padding-right: .5em; padding-left: .5em;" seems to fix.

I think most of the CSS after end of the media query on Line 210 is a duplicate of previous code.