<b:if cond='data:blog.pageType == "item"'> <style>#sidebar display: none; </style> </b:if>
@media (max-width: 720px) .blog-header h1 font-size: 2.2rem;
: The free subdomain provided by Google for users of the Blogger service. How to Use HTML on Blogspot
A strict 910px width will look terrible on a phone. To fix this, add a media query: