fix chart container heights

styles.css

@@ -234,7 +234,6 @@ body {
     padding: 0.75rem;
     border: 1px solid var(--border);
     box-shadow: var(--shadow);
-    overflow: hidden;
 }
 
 .chart-card h3 {
@@ -253,13 +252,15 @@ body {
 
 /* Chart Containers - Fixed heights */
 .chart-container {
-    height: 280px;
+    height: 350px;
     width: 100%;
+    min-height: 350px;
 }
 
 .chart-container-tall {
-    height: 380px;
+    height: 500px;
     width: 100%;
+    min-height: 500px;
 }
 
 /* Footer */