fix class name

css/common.css

@@ -161,7 +161,7 @@ a.c-2:hover {
   margin-bottom: 22px
 }
 
-.mb-36 {
+.mb-48 {
   margin-bottom: 48px
 }
 

index.html

@@ -33,13 +33,13 @@
       <img class="h-100" src="image/thank-you-nin.png" alt="twister" />
     </div>
     <h1 class="f-size-26 f-normal d-inline d-inline-block mb-22">Twister - decentralized P2P microblogging platform</h1>
-    <div class="c-2 mb-36">Twisterarmy is the Twister Project supported by Community</div>
+    <div class="c-2 mb-48">Twisterarmy is the Twister Project supported by Community</div>
     <div>
       <a class="btn btn-1" href="https://github.com/orgs/twisterarmy/projects">Roadmap</a>
       <a class="btn btn-1" href="#">Guide</a>
     </div>
   </div>
-  <div class="mw-1024 mx-auto of-hidden mb-36">
+  <div class="mw-1024 mx-auto of-hidden mb-48">
     <div class="grid float-left w-33-100">
       <div class="p-16">
         <div class="p-16 bg-c-3 b-1 b-c-0 b-radius-4">