-sizing:border-box;
         -webkit-box-sizing:border-box;
         box-sizing:border-box;
     }

     html, body, div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre,
     abbr, address, cite, code, del, dfn, em, img, ins, kbd, q, samp,
     small, strong, sub, sup, var, b, i, dl, dt, dd, ol, ul, li,
     fieldset, form, label, legend, caption, article, aside, canvas, details, figcaption, figure,  footer, header, hgroup,
     menu, nav, section, summary, time, mark, audio, video {
     