Black and white theme until hovered
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Convert an image to grayscale in HTML/CSS
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Spin or rotate an image on hover
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How to highlight important parts (with a gray background)
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How to force a hover state with jQuery?
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CSS :selected pseudo class similar to :checked, but for  elements
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How to display image over image on hover with css
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Theme Activate Hook
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Background color doesn't work after float
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How to quickly change multiple colors in the same text area?
120466
How to view blocks with Text Overlay on hover?
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CSS hover border makes inline elements adjust slightly
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Can I set background image and opacity in the same property?
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Use a consistent style for tooltips
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How do I simulate a mouseover in pure JavaScript that activates the CSS ":hover"?
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Cols, colgroups and css ":hover" pseudoclass
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Invert Colors Stylesheet White on Black
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How to change colors during animation?