* {
  	font-family: 'Open Sans';
	font-size: 20px;
	font-style: normal;
	font-variant: normal;
	font-weight: 500;
	line-height: 26.4px;
}

.controls {
	font-size: 16px;
}
  
.Graph {
	width: 800px;
	display: block;
	margin-left: auto;
	margin-right: auto;
}

div {
	width: 580px;
	display: block;
	margin-left: auto;
	margin-right: auto;
}
    
.axis path, .axis line {
	fill: none;
	stroke: black;
	shape-rendering: crispEdges;
}
			
.axis text {
	font-family: sans-serif;
	font-weight: none;
	font-size: 14px;
}

line.arrow {
   	stroke: #999;
   	stroke-width: 1px;
}
	
marker#arrow {
   	fill: #999;
}
