diff --git a/charts.html b/charts.html
index fecbbee..0faae55 100644
--- a/charts.html
+++ b/charts.html
@@ -26,18 +26,21 @@
                     label: 'Humidity',
                     data: humidity,
                     borderColor: humidityColor,
+                    fill: false,
                     id: 'humidity',
                     yAxisID: 'y-axis-3',
                 }, {
                     label: 'Temperature',
                     data: temp,
                     borderColor: tempColor,
+                    fill: false,
                     id: 'temp',
                     yAxisID: 'y-axis-2',
                 }, {
                     label: 'Co2 Concentration',
                     data: co2,
                     borderColor: co2Color,
+                    fill: false,
                     id: 'co2',
                     yAxisID: 'y-axis-1',
                 }]