Editing Module:RoundN/styles.css

/* .tbr tournament-bracket-round */
.tbr {
	margin: .9em 2em 1em 1em;
	border: 0;
	font-size: 90%;
	border-collapse: separate;
	box-sizing: border-box;
}
.tbr-scroller {
	border-bottom:1px solid #eee;
	display:inline-block;
}
.tbr-scroller-head {
	height: 3em;
	border-bottom: inherit;
	margin-right: 17px;
	overflow: hidden;
}
.tbr-scroller-body {
	overflow-y: scroll;
	max-height: 140px;
}
/*
 * Make the brackets vertically more compact.
 * That is, to have less space between matches of the same round.
 */
.tbr-flex-tree {
	
}
/*
 * Make the brackets horizontally more compact.
 * That is, to have less space between matches of following rounds.
 */
.tbr-short-brackets {
	
}
/* 
 * Make scorce cells slight wider
 */
.tbr-wide-score .tbr-score {
	width: 40px;	
}
/*
 * Head cells for rounds
 */
.tbr-head {
	background-color: #f2f2f2;
	color: #202122;
	text-align: center;
	border: 1px solid #aaa;
}
/*
 * Cells for participants/competitors
 */
.tbr-comp {
	background-color: #f9f9f9;
	border: 1px solid #aaa;
	color: #202122;
	padding: 0 .6ex;
	width: 170px;
}
/*
 * Score cells
 */
.tbr-score {
	background-color: #f9f9f9;
	border: 1px solid #aaa;
	color: #202122;
	text-align: center;
	width: 30px;
}
.tbr-winner {
	font-weight: bold;
}
/* top and right */
.tbr-branch-tr {
	border-width: 3px 3px 0 0;
	border-style: solid;
}
/* top right bottom */
.tbr-branche-trb {
	border-width: 3px 3px 3px 0;
	border-style: solid;
}
/* top bottom */
.tbr-branch-tb {
	border-width: 3px 0 3px;
	border-style: solid;	
}