style.css

/*
Theme Name: Octopress
Theme URI: https://github.com/wuwx/wordpress-theme-octopress
Description: Octopress theme for WordPress
Author: wuwx
Version: 2.0
License: GNU General Public License
Tags: one-column, two-columns, fixed-width, threaded-comments, sticky-post, translation-ready, microformats, rtl-language-support, editor-style, custom-menu
*/

@import "stylesheets/screen.css";
@import "stylesheets/comments.css";

@media only screen and (max-width: 750px) {
  header[role="banner"] {
    display: none;
  }
  nav[role="navigation"] {
    display: none;
  }
  article .meta {
    display: none;
  }
  article .entry-title {
    font-size: 1.5em;
  }
  aside.sidebar {
    display: none;
  }
  footer[role="contentinfo"] {
    display: none;
  }
}