Rollup merge of #74504 - lzutao:ayu-border-selected-fn, r=GuillaumeGomez

Add right border bar to Dark and Light theme

Demo:
Light theme: #74504 (comment)
Dark theme: #74504 (comment)
Ayu theme: #74504 (comment)

Author: JohnTitor

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

@@ -326,7 +326,7 @@ a.test-arrow:hover {
 
 :target > code, :target > .in-band {
 	background: rgba(255, 236, 164, 0.06);
-	border-right: 3px solid #ffb44c;
+	border-right: 3px solid rgba(255, 180, 76, 0.85);
 }
 
 pre.compile_fail {

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

@@ -274,6 +274,7 @@ a.test-arrow:hover{
 
 :target > code, :target > .in-band {
 	background-color: #494a3d;
+	border-right: 3px solid #bb7410;
 }
 
 pre.compile_fail {

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

@@ -269,6 +269,7 @@ a.test-arrow:hover{
 
 :target > code, :target > .in-band {
 	background: #FDFFD3;
+	border-right: 3px solid #ffb44c;
 }
 
 pre.compile_fail {