Sharepoint resize modal dialog window

 SP.SOD.executeOrDelayUntilScriptLoaded(resizeModalDialog, 'sp.js');
 function resizeModalDialog(){
 var dlg = typeof(SP.UI.ModalDialog.get_childDialog) == "function" ? SP.UI.ModalDialog.get_childDialog() : null;
    if (dlg != null) {
        dlg.autoSize();
}
 }



Modal dialog window

<div class="ms-dlgContent">
    <div class="ms-dlgBorder">
        <div class="ms-dlgTitle"></div>
        <div class="ms-dlgFrameContainer"></div>
    </div>
</div>