[Plugin: SimpleModal Login] Problem after registration

After registration, login form appears. But there is a problem.
Login form’s height is 230px and the elements in the bottom go out of login form.
Like this picture.

There is <div> that causes this problem:
<div id=”simplemodal-login-container-osx” class=”simplemodal-container” style=”position: fixed; z-index: 1002; height: 230px; width: 350px; left: 456.5px; top: 0pt; display: block;”>

When I change height: auto; in the firebug, the problem solves.
How can I fix this problem?