Transparent background.

[squidsk]

in profile_intro.css make the changes in red:

.intro_block .text {
display:block;
padding: {vb:math {vb:stylevar padding}/2-1} 0;
<vb:comment>
background: {vb:stylevar secondarycontent_background};
</vb:comment>
border: {vb:stylevar secondarycontent_border};
}
}