Implement redux.

components/RankingsChart.module.css

@@ -3,6 +3,8 @@
   min-height: 430px;
   font-size: 14px;
   padding: 20px 0;
+  display: flex;
+  flex-direction: column;
 }
 
 .header {
@@ -76,12 +78,14 @@
 
 .body {
   position: relative;
+  flex: 1;
 }
 
 .body:empty:before {
   content: 'No data available';
-  display: block;
   color: #b3b3b3;
-  text-align: center;
-  line-height: 50px;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
 }