Gray out button on disable

GitLab: #195

Change-Id: I6485a81186ce5b30abcdbd85742eaf5d7de42b6d
diff --git a/client/src/themes/Default.ts b/client/src/themes/Default.ts
index cc890ec..0245b67 100644
--- a/client/src/themes/Default.ts
+++ b/client/src/themes/Default.ts
@@ -162,6 +162,9 @@
         main: '#A3C2DA',
         dark: '#06493F',
       },
+      action: {
+        disabled: '#7F7F7F',
+      },
     },
     InfoTooltip: {
       backgroundColor: {
@@ -191,6 +194,9 @@
         main: '#A3C2DA',
         dark: '#06493F',
       },
+      action: {
+        disabled: '#7F7F7F',
+      },
     },
     InfoTooltip: {
       backgroundColor: {