added border and darker color for cookie bar

scss/_colorMixer.scss

 $back-color-2: darken($back-color, $darker-color);
+$back-color-3: darken($back-color-2, $darker-color);
 $accent-color-2: darken($accent-color, $darker-color);
\ No newline at end of file

scss/_cookieinfo.scss

@@ -12,8 +12,9 @@
   text-align: center;
   bottom: 0;
   opacity: 1;
-  background-color: $back-color;
+  background-color: $back-color-3;
   color: $text-color;
+  border: 1px solid $accent-color;
 
 }