fix: webui input-panel exceeds viewpoint on mobile (#714)

assets/arena.html

@@ -356,6 +356,11 @@
     }
 
     @media screen and (max-width: 768px) {
+      body {
+        height: calc(100vh - 56px);
+        height: 100dvh;
+      }
+
       .container {
         padding: 3px;
       }

assets/playground.html

@@ -434,6 +434,11 @@
     }
 
     @media screen and (max-width: 768px) {
+      body {
+        height: calc(100vh - 56px);
+        height: 100dvh;
+      }
+
       .container {
         padding: 3px;
       }