Fix minor problem with rem and key

frontend/src/components/molecules/SideBarTabGroup/style.module.scss

@@ -5,7 +5,7 @@
   margin-bottom: 0.625rem;
   color: #000;
   background: #f6f8fa;
-  font-size: 1rem;
+  font-size: 1.1rem;
   letter-spacing: 0;
   border-width: 0rem;
   line-height: 1.375rem;

frontend/src/components/pages/ModuleList/index.tsx

@@ -56,7 +56,7 @@ const ModuleList: React.FC = () => {
 
       <Row>
         {modules.map((module) => (
-          <ModuleCard module={module} />
+          <ModuleCard module={module} key={module.code}/>
         ))}
       </Row>
     </Container>