Modify previe markdown styles.

Author: jaywcjlove

src/components/PreviewMarkdown/markdown.less

@@ -16,11 +16,10 @@
     }
     pre {
       margin-bottom: 18px;
-      max-height: 35em;
       font-size: 85%;
       line-height: 1.45;
       position: relative;
-      overflow: auto;
+      overflow-x: auto;
       background-color: #f6f8fa;
       border-radius: 3px;
     }

website/components/Markdown/styles/markdown.less

@@ -2,6 +2,11 @@
 code {
   font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
   word-wrap: normal;
+  background-color: rgba(27,31,35,.05);
+  border-radius: 3px;
+  font-size: 85%;
+  margin: 0;
+  padding: .2em .4em;
 }
 
 pre code {