Width accepts an empty value (and it's the default value). This behavior corresponds to display:block style.
You can use any value acceptable for width CSS style.
JavaScript Example
<div id="dpm"></div> <script type="text/javascript"> var dpm = new DayPilot.Month("dpm"); dpm.width = "100%"; // ... dpm.init(); </script>
ASP.NET WebForms Example
<DayPilot:DayPilotMonth runat="server" id="DayPilotMonth1"
Width="100%" ...
/>
ASP.NET MVC Example
@Html.DayPilotMonth("dps", new DayPilotMonthConfig { BackendUrl = ResolveUrl("~/Month/Backend"), Width = "100%", ... })
Java Example (JSP)
<div id="dpm"></div> <script type="text/javascript"> var dpm = new DayPilot.Month("dpm"); dpm.backendUrl = "${pageContext.request.contextPath}/dpm"; dpm.width = "100%"; // ... dpm.init(); </script>