fix app logo size

src/modules/portal/views/home/Home.vue

@@ -10,7 +10,7 @@
           >
             <img
               src="./icon.png"
-              style="width: 20px; height: 20px; line-height: 48px; display: inline-block"
+              style="margin-bottom: 2px; line-height: 48px; display: inline-block"
             />
             云平台主页
           </router-link>