diff --git a/core/index.html b/core/index.html
index 882b33f0..2b02e72c 100644
--- a/core/index.html
+++ b/core/index.html
@@ -16,7 +16,7 @@
 	<body style="display: flex; flex-flow: column; width: 100vw; height: 100vh; position: absolute; max-width: 100%; max-height: 100%">
 		<tf-navigation></tf-navigation>
 		<div id="content" class="hbox" style="flex: 1 0; overflow: scroll">
-			<div id="editPane" class="vbox" style="flex: 0 0 50%; display: none; overflow: scroll">
+			<div id="editPane" class="vbox" style="flex: 0 1 100%; display: none; overflow: scroll">
 				<div class="navigation hbox">
 					<button id="closeEditor" name="closeEditor" accesskey="c" onmouseover="set_access_key_title(event)" data-tip="Close the editor">Close</button>
 					<button id="save" name="save" accesskey="s" onmouseover="set_access_key_title(event)" data-tip="Save the app under the given path">Save</button>
@@ -32,7 +32,7 @@
 					<div style="flex: 1 1; overflow: scroll"><div id="editor" style="width: 100%; height: 100%"></div></div>
 				</div>
 			</div>
-			<div id="viewPane" class="vbox" style="flex: 0 0 50%; overflow: scroll">
+			<div id="viewPane" class="vbox" style="flex: 0 1 100%; overflow: scroll">
 				<iframe id="document" sandbox="allow-forms allow-scripts allow-top-navigation allow-modals allow-popups allow-downloads" style="width: 100%; height: 100%; border: 0"></iframe>
 			</div>
 		</div>
