improve chart styling

static/poopGraph.js

@@ -107,7 +107,7 @@ function plot(data) {
     const northCtx = document.getElementById('northCanvas');
     const southCtx = document.getElementById('southCanvas');
     let options = {
-        maintainAspectRatio: false,
+        aspectRatio: 1,
         interaction: {
             intersect: false,
         },
@@ -127,6 +127,11 @@ function plot(data) {
                 text: 'Wastewater COVID RNA Signal (copies/mL)',
             },
         },
+        elements: {
+            pointWithErrorBar: {
+                errorBarWhiskerSize: 5,
+            },
+        },
     };
 
     const northChart = new Chart(northCtx, {