style:refine css

src/styles/index.scss

@@ -98,10 +98,11 @@ div:focus{
 
 code {
   background: #eef1f6;
-  padding: 15px 10px;
+  padding: 15px 16px;
   margin-bottom: 20px;
   display: block;
   line-height: 36px;
+  font-size: 14px;
   a {
     color: #337ab7;
     cursor: pointer;