erpnext/utilities/page/todo/todo.html

<div class="layout-wrapper" style="min-height: 300px; background-color: #FFFDC9">	
	<a class="close" onclick="window.history.back();">&times;</a>
	<h1>To Do</h1>
	<br>
	<div id="todo-list">
	</div>
	<div style="margin-top: 21px; clear: both">
		<button id="add-todo" class="btn btn-small"><i class="icon-plus"></i> Add</button>
	</div>
</div>