Add Markdown parsing to the preview

static/css/site.css

@@ -11,29 +11,27 @@
     }
 }
 
+* {
+    box-sizing: border-box;
+}
+
 body {
+    overflow-y: scroll;
+    overflow-x: hidden;
     width: 100%;
     height: 100%;
     background-color: #111;
     color: #CCC;
     tab-size: 4;
     line-height: 1.2;
-    /* text-align: justify; */
-}
-
-body {
-    overflow-y: scroll;
-    /* Show vertical scrollbar */
 }
 
 .main-container {
     margin-left: auto;
     margin-right: auto;
     width: 95%;
-    max-width: 1080px;
+    max-width: 1280px;
     padding: 1em 0 1em 0;
-    /* padding-top:1em;
-    padding-bottom:1em; */
 }
 
 .content {
@@ -97,4 +95,5 @@ ul {
     display: flex;
     flex-direction: column;
     flex-wrap: nowrap;
+    width: 95%;
 }