This is a conflict with your template css between this two elements at index.php/website-design #3 (line 128)
.sig_cont {
height: 230px;
width: 230px;
}
and at plugins/content/plugin_jw_sig/sig.css(line 7)
.sig_cont {
float: left;
}
What you can do in order to reduce the gap to 160px for example, is to change the second one with this:
.sig_cont {
float: left;
height: 160px !important;
}