i got a problem.

whit  a whitebox that's appered under the forum. 

here's the costum CSS i have in use.

.site-description {
visibility: hidden;
}

.site-branding {
visibility: hidden;
display: none;
}

#colophon.site-footer {
display: none;
}

.main-navigation ul {
display: none;
}

#wpforo #wpforo-wrap.wpf-dark {
padding: 0px;
width: -1px;
top: 0px;
}

#page.site {
font-size: 0px;
background-color: #323232;
}

#wpforo #wpforo-wrap #wpforo-title {
display: none;
}

#wpforo #wpforo-wrap.wpf-dark .wpfl-1 .wpforo-category div {
font-size: 17px;
}

any help is appreciated