Chrome looks good – Firefox looks very different? header.php

Hi,

I’d love some help with my header.php

I want an image slider to be below my menu without any gap.

At the bottom on header.php I have
<div id=”main”>
<div style=”margin-top: -26px;”><?php echo do_shortcode(‘[ccslider id=”1″]’); ?></div>

In Chrome it looks great – but in firefox it’s to the right of the page?

Thanks in advance,
Louis