#float-menu{position:fixed;bottom:20%;right:0;border-top:1px solid #CCC;border-left:1px solid #CCC;border-bottom:1px solid #CCC;background:#EEE}
#float-menu ul{padding:0}
#float-menu li{margin:5px;list-style-type:none}
#float-menu li,#float-menu li a{width:24px;height:24px}
#float-menu li a{float:left}
#float-menu #menu-right,#float-menu #menu-left,#float-menu li a{background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikAZLnpU9j98zWzuogga5t7pFhJ1QSEOi1OIhmPJ4rMI3kRBHc06cdaPMzr32jOh0JbqF-RmGup1hkbA7RoFyGg7GSoaKL9sifMQf7QT8knAkrhhgUU-1y_dVMaBxquiRy6EjqGxyrtQ0/)}
#float-menu #menu-right a{background-position:0 -120px}
#float-menu #menu-right a:hover,#float-menu #menu-right{background-position:-24px -120px}
#float-menu #menu-left a{background-position:0 -24px}
#float-menu #menu-left a:hover,#float-menu #menu-left{background-position:-24px -24px}
#float-menu #menu-random a{background-position:0 -48px}
#float-menu #menu-random a:hover{background-position:-24px -48px}
#float-menu #menu-home a{background-position:0 -72px}
#float-menu #menu-home a:hover{background-position:-24px -72px}
#float-menu #menu-top a{background-position:0 -96px}
#float-menu #menu-top a:hover{background-position:-24px -96px}

<div id='float-menu'>
 <ul>
  <li id='menu-right'>
   <b:if cond='data:olderPageUrl'>
    <b:if cond='data:olderPageUrl != data:blog.url'>
     <a expr:href='data:olderPageUrl' expr:title='data:olderPageTitle' rel='prev'/>
    </b:if>
   </b:if>
  </li>
  <li id='menu-left'>
   <b:if cond='data:newerPageUrl'>
    <b:if cond='data:newerPageUrl != data:blog.url'>
     <a expr:href='data:newerPageUrl' expr:title='data:newerPageTitle' rel='next'/>
    </b:if>
   </b:if>
  </li>
  <li id='menu-random'>
   <script type='text/javaScript'>//<![CDATA[
   var rdp_current=0;total_posts=0;function totalposts(json){total_posts=json.feed.openSearch$totalResults.$t}document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&max-results=0&callback=totalposts\"><\/script>');function getvalue(){rdp_current=1+Math.round(Math.random()*(total_posts-1))};
   //]]></script>
   <script type='text/javaScript'>//<![CDATA[
   function rdp(json){var dw='';entry=json.feed.entry[0];for(var i=0;i<entry.link.length;i++){if(entry.link[i].rel=='alternate'){rdp_posturl=entry.link[i].href}};dw+='<a href="'+rdp_posturl+'"  title="Bài đăng Ngẫu nhiên" rel="nofollow"></a>';document.getElementById('menu-random').innerHTML=dw;};getvalue();document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&start-index='+rdp_current+'&max-results=1&callback=rdp\"><\/script>');
   //]]></script>
  </li>
  <li id='menu-home'>
   <a expr:href='data:blog.homepageUrl' title='Trang chủ'/>
  </li>
  <li id='menu-top'>
   <a href='#' rel='nofollow' title='Lên trên'/>
  </li>
 </ul>
</div>