Merge branch 'study' into examination

src/common/CategoryTag/index.js

 import React from 'react'
+import './index.scss'
 
 const Tag = (props) => {
     return (

src/components/study/free-courses/free-courses.scss

@@ -4,12 +4,6 @@
     flex-wrap: wrap;
     justify-content: space-between;
 
-    .state {
-        box-sizing: border-box;
-        border-radius: 0 10px 10px 0;
-        padding: 1px 5px;
-    }
-
     .top {
         position: absolute;
         top: 10px;