diff --git a/index.html b/index.html
index 0b7915e..eefc007 100644
--- a/index.html
+++ b/index.html
@@ -10,8 +10,8 @@
 
     <style>
         #canvas {
-            width: 500px;
-            height: 500px;
+            width: 100%;
+            height: 800px;
             border: 1px solid black;
         }
     </style>
diff --git a/receiver.html b/receiver.html
index ca1f11d..f450ef5 100644
--- a/receiver.html
+++ b/receiver.html
@@ -10,8 +10,8 @@
 
     <style>
         #canvas {
-            width: 500px;
-            height: 500px;
+            width: 100%;
+            height: 800px;
             border: 1px solid black;
         }
     </style>