You have conflicting CSS in the avalanche.css file.
change:
#content2 img{
padding:1px;
display:inline;
background:#cccccc;
color:#000000;
border:4px solid #f0f0f0;
}
to:
#content2 img{
padding:1px;
display:inline;
/*background:#cccccc;*/
color:#000000;
border:4px solid #f0f0f0;
}
your background color setting is causing the problem.