Remove .std div (wrapper) from Magento CMS Pages through xml

Add below xml code to local.xml of your current theme or cms.xml file.

1. Remove from all cms pages.

<cms_page>
    <reference name="content">
        <remove name="cms.wrapper"/>
    </reference>
</cms_page>

2. Remove from CMS Home page only

<cms_index_index>
    <reference name="content">
        <remove name="cms.wrapper"/>
    </reference>
</cms_index_index>