rustdoc: factor out common button CSS

Author: notriddle

src/librustdoc/html/static/css/rustdoc.css

@@ -290,20 +290,21 @@ p:last-child {
 button {
 	/* Buttons on Safari have different default padding than other platforms. Make them the same. */
 	padding: 1px 6px;
+	/* Opinionated tweak: use pointer cursor as clickability signifier. */
+	cursor: pointer;
 }
 
+/* end tweaks for normalize.css 8 */
+
 button#toggle-all-docs {
 	padding: 0;
 	background: none;
 	border: none;
-	cursor: pointer;
 	/* iOS button gradient: https://stackoverflow.com/q/5438567 */
 	-webkit-appearance: none;
 	opacity: 1;
 }
 
-/* end tweaks for normalize.css 8 */
-
 .rustdoc {
 	display: flex;
 	flex-direction: row;
@@ -1305,7 +1306,6 @@ a.test-arrow:hover {
 #titles > button {
 	text-align: center;
 	font-size: 1.125rem;
-	cursor: pointer;
 	border: 0;
 	border-top: 2px solid;
 	flex: 1;
@@ -1345,7 +1345,6 @@ a.test-arrow:hover {
 	font-weight: bold;
 	background: none;
 	color: inherit;
-	cursor: pointer;
 	text-align: center;
 	border: none;
 	outline: none;
@@ -1367,7 +1366,6 @@ a.test-arrow:hover {
 
 #settings-menu > a, #help-button > a, #copy-path {
 	width: 33px;
-	cursor: pointer;
 	line-height: 1.5;
 }
 
@@ -1796,7 +1794,6 @@ in storage.js
 		z-index: 10;
 		border-top-right-radius: 3px;
 		border-bottom-right-radius: 3px;
-		cursor: pointer;
 		border: 1px solid;
 		border-left: 0;
 	}
@@ -1967,7 +1964,6 @@ in storage.js
 	position: absolute;
 	top: 0.25em;
 	z-index: 1;
-	cursor: pointer;
 	padding: 0;
 	background: none;
 	border: none;