Fix run button style

Author: GuillaumeGomez

src/librustdoc/html/static/rustdoc.css

@@ -561,7 +561,8 @@ a {
 	content: '\2002\00a7\2002';
 }
 
-.docblock a:not(.srclink):hover, .docblock-short a:not(.srclink):hover, .stability a {
+.docblock a:not(.srclink):not(.test-arrow):hover,
+.docblock-short a:not(.srclink):not(.test-arrow):hover, .stability a {
 	text-decoration: underline;
 }
 

src/librustdoc/html/static/themes/dark.css

@@ -163,7 +163,8 @@ a {
 	color: #ddd;
 }
 
-.docblock a:not(.srclink), .docblock-short a:not(.srclink), .stability a {
+.docblock a:not(.srclink):not(.test-arrow), .docblock-short a:not(.srclink):not(.test-arrow),
+.stability a {
 	color: #D2991D;
 }
 

src/librustdoc/html/static/themes/light.css

@@ -163,7 +163,8 @@ a {
 	color: #000;
 }
 
-.docblock a:not(.srclink), .docblock-short a:not(.srclink), .stability a {
+.docblock a:not(.srclink):not(.test-arrow), .docblock-short a:not(.srclink):not(.test-arrow),
+.stability a {
 	color: #3873AD;
 }