Remove non-color styling from theme; Button styling fixes

src/scss/_elements.scss

@@ -115,6 +115,8 @@ span .tag {
   line-height: 30px;
   cursor: pointer;
   user-select: none;
+  text-decoration: none;
+  font-weight: bold;
 
   &.small {
     font-size: 80%;
@@ -157,6 +159,7 @@ span .tag {
       font-size: 200%;
       cursor: pointer;
       user-select: none;
+      text-decoration: none;
     }
   }
 }

src/scss/_structure.scss

@@ -344,6 +344,7 @@ $nav-font-height: 16px;
       font-size: 25px;
       line-height: 10px;
       cursor: pointer;
+      text-decoration: none;
 
       &:before {
         content: '';

src/scss/themes/_default.scss

@@ -75,8 +75,6 @@
     border: 1px solid darken($button-color, 2);
     background-color: $button-color;
     color: #000000;
-    text-decoration: none;
-    font-weight: bold;
 
     &.red {
       background-color: $red;