Added user sign up and login.

assets/css/_theme.scss

@@ -36,6 +36,7 @@ $breakpoint4: 1500px;
     --female: #f0a;
 
     --alert: #f00;
+    --error: #f00;
     --warn: #fa0;
     --success: #5c2;
 
@@ -58,6 +59,7 @@ $breakpoint4: 1500px;
     --tile: #2a2a2a;
 
     --link: #dd6688;
+    --link-external: #48f;
     --empty: #333;
 
 	--crease: #eaeaea;