学习按钮的宽度调整

src/views/question-bank.vue

@@ -602,7 +602,7 @@ export default {
             display: inline-block;
             height: 25px;
             line-height: 23px;
-            padding: 0 6px;
+            padding: 0 10px;
             color: #449284;
             border: 1px solid #449284;
             border-radius: 15px;