fixing width/height in FF

public/app.js

@@ -111,10 +111,9 @@ const renderPoints = () => {
 }
 
 const setupGraph = ()=>{
-	d3.select('svg');
-	d3.select('svg')
-		.style('width', WIDTH)
-		.style('height', HEIGHT);
+	d3.select('#container')
+		.attr('width', WIDTH)
+		.attr('height', HEIGHT);
 
 	xScale = d3.scaleTime();
 	xScale.range([0,WIDTH]);