I need help with css

Hi, I need help with css in http://zampaa.com/ 

The problem is when you click on "REGISTRO"; the registration form opens but the captcha does not fit.

I think the problem can be solved by editing this section of code :

.ac_subitem{
width:300px;
height:0px; /* animate to 400px */
top:30%;
right:0px;
margin-top:0px; /* animate to -200px */
position:fixed;
z-index:99;
overflow:hidden;
background:transparent url(../images/bg_menu.png) repeat top left;

}

Can anyone help me?

 

Thank you

 

 

 

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