diff --git a/client/src/components/CallButtons.tsx b/client/src/components/CallButtons.tsx
index d1beab8..b77fd5a 100644
--- a/client/src/components/CallButtons.tsx
+++ b/client/src/components/CallButtons.tsx
@@ -85,6 +85,9 @@
     '&:hover': {
       backgroundColor: paletteColor.main,
     },
+    '&:disabled': {
+      backgroundColor: theme.palette.action.disabled,
+    },
   };
 });
 
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: {