@charset "utf-8"; 

* { margin: 0; padding: 0; box-sizing:border-box; }

img { border: none; outline: none; }

 /* html5未定義ブラウザ用 */
article, aside, details, figcaption, figure, header, main, menu, nav, section, footer { display: block; }

 /* clearfixの代用 */
article, aside, header, main, nav, section, footer { overflow:hidden; }