Optimize statistics page stylesheet

src/assets/css/pages/system/index.scss

@@ -6,7 +6,7 @@
   flex-wrap: wrap;
   justify-content: center;
 
-  >.card-box {
+  > .card-box {
     width: 48%;
     flex: 0 0 auto;
 
@@ -54,15 +54,21 @@
         .value-chart {
           justify-content: space-around;
           width: 0;
-          >div {
+
+          > div {
             max-height: 12px;
             height: 12px;
-            >* {
+
+            > * {
               transform: translateY(1px);
             }
           }
         }
 
+        .value-percent {
+          text-align: right;
+        }
+
         > * {
           gap: 5px;
         }