source/features/extend-diff-expander.css


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/* Hovering the line will highlight the first direction button, unless you hover the buttons directly */
.js-expandable-line:hover .blob-num:not(:hover) .directional-expander:first-child,
.js-expandable-line:hover .blob-num:not(:hover) + .blob-code {
	border-color: #0366d6;
	color: #fff;
	background: #0366d6;
	cursor: pointer;
}