diff --git a/index.html b/index.html
index 4659b1a..6cffe6b 100644
--- a/index.html
+++ b/index.html
@@ -3,21 +3,35 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Live Heatmap with Continuous Scrolling</title>
+    <title>Live Heatmap with Intensity</title>
     <script src="https://d3js.org/d3.v7.min.js"></script>
     <style>
         svg {
             display: block;
             margin: auto;
         }
-        .y-axis {
-            display: none;
+
+        .legend {
+            font-size: 12px;
+        }
+
+        .legend-item {
+            display: flex;
+            align-items: center;
+            margin-bottom: 5px;
+        }
+
+        .legend-color {
+            width: 15px;
+            height: 15px;
+            margin-right: 5px;
         }
     </style>
 </head>
 <body>
-    <h2>Live Heatmap with Continuous Scrolling</h2>
+    <h2>Live Heatmap with Intensity</h2>
     <div id="chart"></div>
+    <div id="legend" class="legend"></div>
 
     <script>
         // Dimensions
@@ -25,6 +39,33 @@
         const width = 800 - margin.left - margin.right;
         const height = 500 - margin.top - margin.bottom;
 
+        // Categories with labels
+        const categories = [
+            { id: 0, label: "User Onboarded", color: "#1f77b4" },
+            { id: 1, label: "Payment Accepted", color: "#ff7f0e" },
+            { id: 2, label: "Payment Failed", color: "#d62728" },
+            { id: 3, label: "Product Added to Cart", color: "#9467bd" },
+            { id: 4, label: "Checkout Started", color: "#2ca02c" },
+            { id: 5, label: "Order Placed", color: "#8c564b" },
+            { id: 6, label: "Order Cancelled", color: "#e377c2" },
+            { id: 7, label: "Refund Processed", color: "#7f7f7f" },
+            { id: 8, label: "Subscription Renewed", color: "#bcbd22" },
+            { id: 9, label: "Feedback Submitted", color: "#17becf" },
+        ];
+
+        // Store last intensity for each category
+        const lastIntensity = new Map(categories.map(c => [c.id, Math.random()]));
+
+        // Create Legend
+        const legend = d3.select("#legend");
+        categories.forEach(category => {
+            const item = legend.append("div").attr("class", "legend-item");
+            item.append("div")
+                .attr("class", "legend-color")
+                .style("background-color", category.color);
+            item.append("span").text(category.label);
+        });
+
         // Create SVG
         const svg = d3.select("#chart")
             .append("svg")
@@ -39,18 +80,10 @@
             .range([height, 0]);
 
         const x = d3.scaleBand()
-            .domain(d3.range(10)) // Example: 10 categories
+            .domain(categories.map(c => c.id)) // Category IDs
             .range([0, width]);
 
-        // Heatmap color scale
-        const colorScale = d3.scaleSequential(d3.interpolateYlOrRd)
-            .domain([0, 100]); // Adjust for event intensity
-
-        // Axis
-        const yAxis = svg.append("g")
-            .attr("class", "y-axis")
-            .call(d3.axisLeft(y).ticks(6));
-
+        // Heatmap group
         const grid = svg.append("g");
 
         // Initialize heatmap
@@ -64,9 +97,11 @@
                 .attr("width", x.bandwidth())
                 .attr("y", d => y(new Date(d.timestamp)))
                 .attr("height", 5) // Fixed height for heatmap blocks
-                .attr("fill", d => colorScale(d.value))
+                .attr("fill", d => categories[d.category].color)
+                .attr("opacity", d => d.intensity)
                 .merge(cells) // Merge updates
                 .attr("y", d => y(new Date(d.timestamp)))
+                .attr("opacity", d => d.intensity)
                 .attr("visibility", d =>
                     y(new Date(d.timestamp)) >= 0 && y(new Date(d.timestamp)) <= height
                         ? "visible"
@@ -80,15 +115,21 @@
         // Real-time simulation
         let allData = [];
         const scrollingSpeed = 10; // Pixels per second
-        const pixelsPerMillisecond = scrollingSpeed / 1000;
 
         function generateData() {
-            const newData = Array.from({ length: 10 }, (_, i) => ({
-                id: `${Date.now()}-${i}`,
-                category: i,
-                timestamp: Date.now(),
-                value: Math.random() * 100,
-            }));
+            // Simulate sporadic events with intensity
+            const newData = categories.map(c => {
+                if (Math.random() < 0.5) return null; // 50% chance no data for this category
+                const newIntensity = Math.random(); // Random intensity
+                const smoothIntensity = d3.interpolate(lastIntensity.get(c.id), newIntensity)(0.5); // Smooth transition
+                lastIntensity.set(c.id, smoothIntensity); // Update last intensity
+                return {
+                    id: `${Date.now()}-${c.id}`,
+                    category: c.id,
+                    timestamp: Date.now(),
+                    intensity: smoothIntensity,
+                };
+            }).filter(Boolean); // Remove null values
 
             // Append new data and remove older ones beyond the last 60 seconds
             allData = [...allData, ...newData].filter(d =>
@@ -116,9 +157,6 @@
 
             // Update positions of all heatmap cells
             updateHeatmap(allData);
-
-            // Smoothly shift axis
-            yAxis.call(d3.axisLeft(y).ticks(6));
         });
     </script>
 </body>
