Refactor components and styles.

components/WebsiteChart.module.css

@@ -13,7 +13,7 @@
   display: flex;
   justify-content: space-between;
   align-items: center;
-  margin-bottom: 10px;
+  padding: 10px 0;
 }
 
 .sticky {
@@ -21,7 +21,6 @@
   top: 0;
   margin: auto;
   background: #fff;
-  padding: 10px 0;
   border-bottom: 1px solid #e1e1e1;
-  z-index: 1;
+  z-index: 2;
 }