Using the same code in different browsers can be displayed in different ways. Resetting styles will help you to avoid such problems.

Resetting the Browser Default Styles in CSS

<!-- source: http://www.apphp.com/index.php?snippet=css-reset-browser-default-styles -->
<style type="text/css">
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code
, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video
    { margin:0; padding:0; border:0; font-size:100%; font:inherit; vertical-align:baseline; outline:none; }
html
    { height:101%; } /* always show scrollbars */
body
    { font-size:62.5%; line-height:1; font-family:Arial, Tahoma, Verdana, sans-serif; }
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section
    { display:block; }
img
    { border:0; max-width:100%; }
a
    { text-decoration:none; }
a:hover
     { text-decoration:underline; }
ol, ul
    { list-style:none; }
blockquote, q
    { quotes:none; }
blockquote:before, blockquote:after, q:before, q:after
     { content:""; content:none; }
strong
    { font-weight:bold; } 
input
    { outline:none; }
table
    { border-collapse:collapse; border-spacing:0; }
</style>