my submenu has messed up css and it showing too low

Hi. On the homepage, the menu tab has been played around with css and it was never finished/done right in the first place. Can you guys put in whatever needed code to just have it show correctly. I've been told by others that differnet browsers and screen sizes make it show up in sifferent places and it should just show up under the word home like any normal dropdown menu. Ive attached a screenshot of how it's messed up on my 21 inch mac on chrome