Resolve "fix: readability on text button"

Closes #16 (closed)

common/common.scss

@@ -117,7 +117,7 @@ p {
 
 /// text box ///
 .topic-list-item.visited a.title:not(.badge-notification), .latest-topic-list-item.visited a.title:not(.badge-notification), .category-topic-link.visited a.title:not(.badge-notification) {
-  color: $primary;
+  color: $color-white-smoke;
 }
 
 .navigation-categories .search-banner {
@@ -693,3 +693,8 @@ tbody {
 .navigation-topics .container.list-container{
   background-color: $secondary;
 }
+
+/// Category Badge ///
+.badge-wrapper.bullet span.badge-category {
+  color: $color-white-smoke;
+}