Demo

Hôm nay mình hướng dẫn các bạn thêm Sidebar bài viết mới cho blogger đẹp + chuẩn hơn hết là nhẹ ^^
có demo ngay trên trang Vũ Steven 

<style scoped="" type="text/css">
ul.rcentside *{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
ul.rcentside{font:normal normal 11px Verdana,Geneva,sans-serif}
ul.rcentside,ul.rcentside li{margin:0;padding:0;list-style:none;position:relative}
ul.rcentside{width:100%;height:500px}
ul.rcentside li{height:24.5%;position:absolute;padding:0;width:49.5%;float:left;overflow:hidden;display:none}
ul.rcentside li:nth-child(1),ul.rcentside li:nth-child(2),ul.rcentside li:nth-child(3),ul.rcentside li:nth-child(4){display:block}
ul.rcentside img{border:0;width:100%;height:100%}
ul.rcentside li:nth-child(1){width:100%;height:49.5%;margin:0 0 2px;left:0;top:0}
ul.rcentside li:nth-child(2){left:0;top:50%}
ul.rcentside li:nth-child(3){left:50.5%;top:50%}
ul.rcentside li:nth-child(4){width:100%;left:0;top:75%}
ul.rcentside  .overlayx,ul.rcentside li{-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out}
ul.rcentside .overlayx{width:100%;height:100%;position:absolute;z-index:2;left:0;top:0;background-image:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsfuV7qG3gg9hZewMV3ckLKNEmLW3BOMG_R1aGbKv7H7422w7evlpjjBKpmCFQeAZojsJ0uKjRs3NMnjGttFp0pJ2KDpWQzS9R1-jRhvZZbSX0VZN3noX4LshX6ZT1Ec-PE1D6iKI95xk/s1600/linebg-fade.png);background-position:50% 50%;background-repeat:repeat-x}
ul.rcentside .overlayx,ul.rcentside img{border:4px solid #2E8DCE;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px}
ul.rcentside li:nth-child(1) .overlayx{background-position:50% 25%}
ul.rcentside .overlayx:hover{-ms-filter:"progid:DXImageTransform.Microsoft. Alpha(Opacity=10)";filter:alpha(opacity=10);-khtml-opacity:0.1;-moz-opacity:0.1;opacity:0.1}
ul.rcentside h4{position:absolute;bottom:30px;z-index:2;color:white;margin:0;width:100%;padding:0 10px;line-height:1.5em;font-family:Georgia,Times,"Times New Roman";font-weight:normal}
ul.rcentside li:nth-child(1) h4,ul.rcentside li:nth-child(4) h4{font-size:150%}
ul.rcentside .label_text{position:absolute;bottom:10px;left:10px;z-index:2;color:white;font-size:90%}
ul.rcentside li:nth-child(2) .autname,ul.rcentside li:nth-child(3) .autname{display:none}
.buttons{margin:5px 0 0}
.buttons a{display:inline-block;text-indent:-9999px;width:15px;height:25px;position:relative}
.buttons a::before{content:"";width:0;height:0;border-width:8px 7px;border-style:solid;border-color:transparent #535353 transparent transparent;position:absolute;top:50%;margin-top:-8px;margin-left:-10px;left:50%}
.buttons a.nextx::before{border-color:transparent transparent transparent #535353;margin-left:-3px}
</style>
<div id="featuredpostside"></div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">function FeaturedPostSide(a){(function(e){var h={blogURL:"",MaxPost:4,idcontaint:"",ImageSize:100,interval:5000,autoplay:false,loadingClass:"loadingxx",pBlank:"http://1.bp.blogspot.com/-htG7vy9vIAA/Tp0KrMUdoWI/AAAAAAAABAU/e7XkFtErqsU/s1600/grey.gif",MonthNames:["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],tagName:false};h=e.extend({},h,a);var g=e(h.idcontaint);var d=h.MaxPost*200;g.html('<div class="sliderx"><ul class="rcentside"></ul></div><div class="buttons"><a href="#" class="prevx">prev</a><a href="#" class="nextx">next</a></div>');var f=function(w){var q,k,m,u,x,p,t,v,r,l="",s=w.feed.entry;for(var o=0;o<s.length;o++){for(var n=0;n<s[o].link.length;n++){if(s[o].link[n].rel=="alternate"){q=s[o].link[n].href;break}}if("media$thumbnail" in s[o]){u=s[o].media$thumbnail.url.replace(/\/s[0-9]+\-c/g,"/s"+h.ImageSize+"-c")}else{u=h.pBlank.replace(/\/s[0-9]+(\-c|\/)/,"/s"+h.ImageSize+"$1")}k=s[o].title.$t;r=s[o].published.$t.substring(0,10);m=s[o].author[0].name.$t;x=r.substring(0,4);p=r.substring(5,7);t=r.substring(8,10);v=h.MonthNames[parseInt(p,10)-1];l+='<li><a target="_blank" href="'+q+'"><div class="overlayx"></div><img class="random" src="'+u+'"/><h4>'+k+'</h4></a><div class="label_text"><span class="date"><span class="dd">'+t+'</span> <span class="dm">'+v+'</span> <span class="dy">'+x+'</span></span> <span class="autname">'+m+"</span></div></li>"}e("ul",g).append(l).addClass(h.loadingClass)};var c=function(){e(h.idcontaint+" .nextx").click()};var b=function(){e.get((h.blogURL===""?window.location.protocol+"//"+window.location.host:h.blogURL)+"/feeds/posts/summary"+(h.tagName===false?"":"/-/"+h.tagName)+"?max-results="+h.MaxPost+"&orderby=published&alt=json-in-script",f,"jsonp");setTimeout(function(){e(h.idcontaint+" .prevx").click(function(){e(h.idcontaint+" .sliderx li:first").before(e(h.idcontaint+" .sliderx li:last"));return false});e(h.idcontaint+" .nextx").click(function(){e(h.idcontaint+" .sliderx li:last").after(e(h.idcontaint+" .sliderx li:first"));return false});if(h.autoplay){var i=h.interval;var j=setInterval(c,i);e(h.idcontaint+" .sliderx li:first").before(e(h.idcontaint+" .sliderx li:last"));e(h.idcontaint+" .sliderx").hover(function(){clearInterval(j)},function(){j=setInterval(c,i)})}e("ul",g).removeClass(h.loadingClass)},d)};e(document).ready(b)})(jQuery)};</script>
<script type='text/javascript'>
//<![CDATA[
FeaturedPostSide({
blogURL:"http://www.vusteven.info",
MaxPost:8,
idcontaint:"#featuredpostside",
ImageSize:300,
interval:5000,
autoplay:true,
tagName:false
});
//]]>
</script>

Chú ý : bạn thay link http://www.vusteven.info thành link của bạn nhen

Chúc các bạn thành công !