chore: make padding and margin clearer

Author: edwardzjl

web/src/routes/root/Sidebar/index.module.css

@@ -44,12 +44,10 @@
 .sidebarDateGroup {
     color: var(--text-3);
     text-align: start;
-    margin: 10px;
+    padding: 10px;
     margin-top: 20px;
 }
 
-
-
 .sidebarBottom {
     margin-top: auto;
     width: 90%;