Solving thumbnail is blurred

1. Go to your blogger account 
2. Visit Theme then Edit HTML 
3. Copy the following code above the </ body>

Javascript

=======================

<b:if cond='data:blog.pageType != &quot;item&quot;'><script type='text/javascript'>//<![CDATA[//Resize Thumbnail Imagefunction RithiSeth(e,t){for(var g=document.getElementById(e),

m=g.getElementsByTagName("img"),

r=0;r<m.length;r++)m[r].src=m[r].src.replace(/\/s72-c/,"/s"+t)}RithiSeth("Blog1",

1600);//]]></script></b:if>

4. Click Save Theme, and you're done.