How do I move the green bar to the left?

Hello everyone,

I’m trying to move the green gradient bar on top of my site to the left so it will align with the rest of my page.

https://new.hydroponic-gardens.com/wordpress/

I’ve tried a few different things, but nothing seems to work.

Any ideas?

.header-menu{background-image:url(images/tile_back.gif);background-repeat:repeat-x;align:left;clear:both;width:900px;height:25px;margin:15px;padding:0 0 0 0;}

Thanks,
Fernando