The current page has been customized from its template. Revert to template.

If you have customized a SharePoint 2010 aspx page by using SharePoint Designer, you may experience that when opening the modified webpage in your browser, that a yellow bar below the navigation bar will appear. This is not actually a error. This is a warning message.

To resolve this, you can use one of the below steps.

First Way :
Add the Css in the master page.
<style type="text/css">
body #pageStatusBar{height:0px; font-size:0px; padding:0px; border-style:none;}
</style>

2nd Way :
The following style attribute to the first DIV:
<div );

function hideWarning() {
    var statusbarContainer = document.getElementById('s4-statusbarcontainer');    
    if (statusbarContainer != null) {   
        var messageSpan = document.getElementById('pageStatusBar');     
        if (messageSpan != null) {
            if (messageSpan.innerHTML.indexOf('The current page has been customized from its template.') == -1)
                statusbarContainer.style.display = 'inline';       
        else 
        statusbarContainer.style.display = 'none';
}
    }
}
</script>

</script>
</head>

 

http://sanjeetsatpathy.blogspot.com/2013/01/the-current-page-has-been-customized.html