feat: improve blockquote style

Author: Ovilia

src/style/mixin.scss

@@ -11,22 +11,11 @@
     }
 
     blockquote {
-        font-size: 12px;
-        color: #999;
-        background-color: #fdfdfd;
+        background-color: #f3f3f3;
         border-left: 2px solid #ddd;
         margin-left: 0px;
 
-        padding: 5px 10px;
-
-        p {
-            margin: 0;
-            font-size: 12px;
-        }
-
-        pre {
-            font-size: 12px;
-        }
+        padding: 10px 20px;
     }
 
     iframe {