diff --git a/ui/lobby/css/app/_hook-chart.scss b/ui/lobby/css/app/_hook-chart.scss
index 78e831b970374..10e652b3c3c16 100644
--- a/ui/lobby/css/app/_hook-chart.scss
+++ b/ui/lobby/css/app/_hook-chart.scss
@@ -69,6 +69,12 @@
       transform: scale(1.15);
     }
   }
+
+  @media (max-width: 480px) {
+    .plot {
+      font-size: 1.15em; // Adjust for mobile phone screens.
+    }
+  }
 }
 
 #hook {