fix link colors in bright theme

assets/_cheese/styles.scss

@@ -1,4 +1,6 @@
+$bodyText: #333;
 $border: #999;
+$headerHover: #f80;
 
 * {
     -webkit-box-sizing: border-box;
@@ -20,7 +22,7 @@ body {
     margin: 0 auto;
     max-width: 960px;
     padding: 10px;
-    color: #333;
+    color: $bodyText;
 }
 
 p {
@@ -87,7 +89,7 @@ hr {
     height: 1px
 }
 
-a, a:visited, a:hover {
+a, a:hover {
     color: #007bff;
     word-wrap: break-word;
 }
@@ -110,19 +112,19 @@ h5 a,
 h6 a,
 h6 a {
     text-decoration: none;
-    color: #333;
+    color: $bodyText;
 }
 
-header a:hover, header a:visited,
-footer a:hover, footer a:visited,
-h1 a:hover, h1 a:visited,
-h2 a:hover, h2 a:visited,
-h3 a:hover, h3 a:visited,
-h4 a:hover, h4 a:visited,
-h5 a:hover, h5 a:visited,
-h6 a:hover, h6 a:visited {
+header a:hover,
+footer a:hover,
+h1 a:hover,
+h2 a:hover,
+h3 a:hover,
+h4 a:hover,
+h5 a:hover,
+h6 a:hover {
     text-decoration: none;
-    color: #f80;
+    color: $headerHover;
 }
 
 header nav {
@@ -312,7 +314,7 @@ nav#TableOfContents ul {
     h1 a:hover, h2 a:hover,
     h3 a:hover, h4 a:hover,
     h5 a:hover, h6 a:hover {
-        color: #f80;
+        color: $headerHover;
     }
     code {
         border-color: $bgBright;