diff --git a/src/tooltip.js b/src/tooltip.js
index 493e3d8..29dd4b1 100644
--- a/src/tooltip.js
+++ b/src/tooltip.js
@@ -91,7 +91,7 @@ export class StatusHeatmapTooltip {
         statusesHtml = `
           statuses:
           <ul>
-            ${_.join(_.map(statuses, v => `<li style="background-color: ${v.color}; padding: 1px;">${v.tooltip}</li>`), "")}
+            ${_.join(_.map(statuses, v => `<li style="background-color: ${v.color}; padding: 1px; text-shadow: 0 0 0.2em #FFF, 0 0 0.2em #FFF, 0 0 0.2em #FFF">${v.tooltip}</li>`), "")}
           </ul>`;
       }
       tooltipHtml += `<div>