Draws line similar to @nstWUIHeader() style.
This macro is defined as:
<div @htmlAttr("class","fullWidth") @htmlAttr("style","border-color: @cssMidTone(); border-style: solid; border-top-width: 0; border-right-width: 0; border-left-width: 0; border-bottom-width: 4px; line-height: 0pt; margin-top: 2pt; margin-bottom: 10pt;")> </div>