corrected disabled button

css/theme.css

@@ -123,6 +123,8 @@
     --hover-button-border: 2px outset #b6e0c3;
     --active-button-background: #9e9e9e;
     --active-button-border: 2px inset #bfbfbf;
+    --disabled-button-background: #808080;
+    --disabled-button-border: 2px solid #808080;
     
     --navbar-left: url('//assets.worlio.com/style/navbar-left');
     --navbar-right: url('//assets.worlio.com/style/navbar-right');