diff --git a/web/rendergraphs.js b/web/rendergraphs.js
index 30a70fe..38227bd 100644
--- a/web/rendergraphs.js
+++ b/web/rendergraphs.js
@@ -14,7 +14,7 @@ function render_graphs(items, history, show_hidden) {
         .enter()
         .filter(key => items[key].show || show_hidden)
         .append("div")
-        .attr("class", "graph-container");
+        .attr("class", key => items[key].show ? "graph-container" : "graph-container-hidden");
 
     // Append SVG elements to each div
     const svgs = graphDivs.append("svg")
diff --git a/web/style.css b/web/style.css
index 836e015..55a3aea 100644
--- a/web/style.css
+++ b/web/style.css
@@ -28,6 +28,10 @@ body {
   margin-right: 20px;
 }
 
+.graph-container-hidden {
+  background: rgba(0, 0, 0, 0.25);
+}
+
 .banner {
   background-color: #177013; /* background color */
   color: #fff; /* text color */