diff --git a/R/highcharter-themes.R b/R/highcharter-themes.R
index d9bca09..9030d90 100644
--- a/R/highcharter-themes.R
+++ b/R/highcharter-themes.R
@@ -89,6 +89,8 @@
                                      fontSize = "large")),
         xAxis = list(
           gridLineColor = gridLineColor,
+          gridLineDashStyle = "ShortDot",
+          gridLineWidth = 1,
           labels = list(style = list(color = axisLabelColor,
                                      fontSize = "medium")),
           lineColor = axisLineColor,