perf[documentation]: refine css

src/views/documentation/index.vue

@@ -1,26 +1,10 @@
 <template>
   <div class="app-container documentation-container">
-    <a
-      class="document-btn"
-      target="_blank"
-      href="https://panjiachen.github.io/vue-element-admin-site/"
-    >Documentation</a>
-    <a
-      class="document-btn"
-      target="_blank"
-      href="https://github.com/PanJiaChen/vue-element-admin/"
-    >Github Repository</a>
-    <a
-      class="document-btn"
-      target="_blank"
-      href="https://panjiachen.gitee.io/vue-element-admin-site/zh/"
-    >国内文档</a>
-    <dropdown-menu :items="articleList" style="float:left;margin-left:50px;" title="系列文章" />
-    <a
-      class="document-btn"
-      target="_blank"
-      href="https://panjiachen.github.io/vue-element-admin-site/zh/job/"
-    >内推招聘</a>
+    <a class="document-btn" target="_blank" href="https://panjiachen.github.io/vue-element-admin-site/">Documentation</a>
+    <a class="document-btn" target="_blank" href="https://github.com/PanJiaChen/vue-element-admin/">Github Repository</a>
+    <a class="document-btn" target="_blank" href="https://panjiachen.gitee.io/vue-element-admin-site/zh/">国内文档</a>
+    <dropdown-menu class="document-btn" :items="articleList" title="系列文章" />
+    <a class="document-btn" target="_blank" href="https://panjiachen.github.io/vue-element-admin-site/zh/job/">内推招聘</a>
   </div>
 </template>
 
@@ -53,8 +37,10 @@ export default {
   margin: 50px;
   display: flex;
   flex-wrap: wrap;
+  justify-content: space-evenly;
+
   .document-btn {
-    margin-left: 50px;
+    flex-shrink: 0;
     display: block;
     cursor: pointer;
     background: black;