Wordpress Menu Drop-downs hidden behind div

[LiAmmx]

I created a form for a Wordpress site http://www.bassetandbeagle.org/adoptionapplication/ and in the CSS code I put div position: absolute, so that the form would scale on mobile devices.\[code\]#formContainer {min-width: 950px;max-width: 950px;padding: 10px;position: absolute;z-index: -1; }\[/code\]Now the drop-down menus, above the form, are hidden behind it.I attempted to set a higher z-index for the menu:\[code\].nav-menu{position: relative;z-index: 1; }\[/code\]But this had no apparent effect. I tried 1, 100, 1000... nadaI was able to get the drop-downs to show up again, by changing the .nav-menu to position: absolute. Unfortunately, this screwed up the positioning of the menus on the page.I am pretty sure I am on the right track with the z-index property, based upon the other posts I have read. So, what am I doing wrong here?Thx