Theme Ddraig

Open styles.css and remove these lines
[syntaxhighlighter brush=css,first-line=1,highlight=0,collapse=false,html-script=false]/* Side panels title, categories and label corners */
h2.panelcap:before, h2.panelcap:after,
#navigation h2:before, .side-label:before,
#navigation h2:after, .side-label:after {
content: " ";
display: block;
position: absolute;
z-index: -1;
background: none;
border-top: 0;
border-bottom: 5px solid #1C5A92;
top: -6px;
}
h2.panelcap:before,
#navigation h2:before,
.side-label:before {
border-right: 5px solid transparent;
right: -1px;
}
h2.panelcap:after,
#navigation h2:after,
.side-label:after {
border-left: 5px solid transparent;
left: -1px;
}
h2.panelcap:before,
h2.panelcap:after {
border-bottom: 5px solid #222;
}

.side-label:before,
.side-label:after {
border-bottom: 5px solid #444;
}[/syntaxhighlighter]

Thanks.