diff --git a/core/index.html b/core/index.html
index 5e74b3b1..62b86908 100644
--- a/core/index.html
+++ b/core/index.html
@@ -59,7 +59,7 @@
 					</div>
 				</div>
 			</div>
-			<div id="viewPane" class="vbox" style="flex: 1 0 50%; overflow: auto">
+			<div id="viewPane" class="vbox" style="flex: 1 0; overflow: auto">
 				<iframe id="document" sandbox="allow-forms allow-scripts allow-top-navigation allow-modals" allow="serial" style="width: 100%; height: 100%; border: 0"></iframe>
 			</div>
 		</div>