[mirotalksfu] - fix main button size 4 mobile

public/css/Room.css

@@ -208,11 +208,8 @@ body {
 
 @media screen and (max-width: 540px) {
     #control button {
-        font-size: 0.8rem;
+        font-size: 1rem;
-    }
+        padding: 5px;
-    #control button i {
-        font-size: 0.8rem;
-        cursor: default;
     }
 }