tt-rss/lib/dijit/themes/soria/layout/ContentPane.css

/* ContentPane */

.soria .dijitContentPane {
    padding: 0;
}

/* nested layouts */
.soria .dijitTabContainerTop-dijitContentPane,
.soria .dijitTabContainerLeft-dijitContentPane,
.soria .dijitTabContainerBottom-dijitContentPane,
.soria .dijitTabContainerRight-dijitContentPane,
.soria .dijitAccordionContainer-dijitContentPane {
    background-color: #fff;
    padding: 5px;
}

.soria .dijitSplitContainer-dijitContentPane,
.soria .dijitBorderContainer-dijitContentPane {
    background-color: #fff;		/* override background-color setting on parent .dijitBorderContainer */
    padding: 5px;
}