clear rects when using form

app.js

@@ -49,6 +49,8 @@ d3.select('svg').call(dragBehavior);
 d3.select('form').on('submit', function(){
 	d3.event.preventDefault();
 
+	d3.selectAll('rect').remove();
+
 	const lat1 = d3.select('input:first-child').node().value
 	const lng1 = d3.select('input:nth-child(2)').node().value
 	const location1 = worldProjection([lat1, lng1]);