app.css

* {
	box-sizing:border-box;
}

html, body {
	background-color: #222222;
	color: #CCCCCC;
	font-family: sans-serif;
}

select {
	border-radius: 5px;
    padding: 0px 5px 0px 5px;
    border: 2px solid #999999;
    margin: 0px 5px 0px 5px;
	background-color: #000000;
	color: #EEEEEE;
}

text-area {
    background-color: #222222;
    color: #FFFFFF;
}

button {
	border-radius: 5px;
	padding: 5px;
}

#tuner-panel {
	position: fixed;
	min-width: 800px;
	width: 90%;
	height: 600px;
	margin-left: 5%;
	margin-right: 5%;
	top: 50%;
	transform: translateY(-50%);
	padding: 20px;
	background-color: #333333
}

#tab-text {
  background-color: #222222;
  color: #FFFFFF;
}

#button-table {
	width: 98%;
	border-collapse: collapse;
	color: #000000;
	margin-left: 1%;
	margin-right: 1%;
}
#button-table tr {
	border-bottom: 1px solid #BBBBBB;
}
#button-table td.note {
	width: 20px;
	height: 26px;
}
#button-table td {
	position: relative;
	text-align: center;
}

.active {
	background-color: #EEEEEE;
	color: #000000;
}

.active-time {
	background-color: #00FF00;
	color: #000000;
}

.button {
	position: absolute;
	background-color: #000000;
	border: 2px solid #000000;
	border-radius: 12px;
	width: 24px;
	height: 24px;
	top: 15px;
	left: -13px;
	cursor: pointer;
	color: #CCCCCC;
	vertical-align: middle;
	line-height: 22px;
	z-index: 999;
	font-size: 12px;
}

.ref {
	display: inline-block;
	background-color: #CCCCCC;
	border-radius: 4px;
	width: 8px;
	height: 8px;
}