Minor CSS edit: darken annotation link on hover

src/main.scss

@@ -50,6 +50,7 @@ input, select, textarea, button {
 
 a {
   color: $primary-color;
+  text-decoration: none;
 }
 a:hover {
   color: darken($primary-color, 20%);
@@ -264,24 +265,45 @@ form {
 .colorize {
   &.color-person {
     color: #ff225a;
+    &:hover {
+      color: darken(#ff225a, 20%);
+    }
   }
   &.color-misc {
     color: #6713e8;
+    &:hover {
+      color: darken(#6713e8, 20%);
+    }
   }
   &.color-location {
     color: #22a6ff;
+    &:hover {
+      color: darken(#22a6ff, 20%);
+    }
   }
   &.color-organization {
     color: #13e864;
+    &:hover {
+      color: darken(#13e864, 20%);
+    }
   }
   &.color-thing {
     color: #D820e8;
+    &:hover {
+      color: darken(#D820e8, 20%);
+    }
   }
   &.color-event {
     color: #ff8c22;
+    &:hover {
+      color: darken(#ff8c22, 20%);
+    }
   }
   &.color-product {
     color: #ffcc2e;
+    &:hover {
+      color: darken(#ffcc2e, 20%);
+    }
   }
 }