Step 1 : Adding the Popular Posts Widget
Go to Blog Title → Layout → Add a Gadget → Popular Posts. Be sure that you have unchecked image thumbnail and snippet box.After adding the widget Save the Template.
Step 2 : Adding the CSS
Firstly go to Blog Title → Template → Edit HTML. Expand <b:skin>...</b:skin> if it is not expanded. Press Ctrl + F. Type ]]></b:skin> in search box and press enter key. [As per the new HTML editor]Add the below given code just above ]]></b:skin>
.popular-posts ul li a {
background: none repeat scroll 0 0 #DDDDDD;
color: #444444;
display: block;
margin: 0 0 0.5em;
padding: 0.4em;
position: relative;
text-decoration: none;
transition: all 0.3s ease-out 0s;
}
.popular-posts ul li a:before {
background: none repeat scroll 0 0 #CCCCCC;
font-weight: 700;
height: 2em;
left: -2.5em;
line-height: 2em;
margin-top: -1em;
position: absolute;
text-align: center;
top: 50%;
width: 2em;
}
.popular-posts ul li a:after {
border: 0.5em solid transparent;
content: "";
left: -1em;
margin-top: -0.5em;
position: absolute;
top: 50%;
transition: all 0.3s ease-out 0s;
}
.popular-posts ul li a:hover {
background: none repeat scroll 0 0 #CCCCCC;
}
.popular-posts ul li a:hover:after {
border-left-color: #CCCCCC;
left: -0.5em;
}
.popular-posts ul li:first-child + li + li + li + li + li + li + li + li + li a:before{content:"10"}
.popular-posts ul li:first-child + li + li + li + li + li + li + li + li a:before{content:"9"}
.popular-posts ul li:first-child + li + li + li + li + li + li + li a:before{content:"8"}
.popular-posts ul li:first-child + li + li + li + li + li + li a:before{content:"7"}
.popular-posts ul li:first-child + li + li + li + li + li a:before{content:"6"}
.popular-posts ul li:first-child + li + li + li + li a:before{content:"5"}
.popular-posts ul li:first-child + li + li + li a:before{content:"4"}
.popular-posts ul li:first-child + li + li a:before{content:"3"}
.popular-posts ul li:first-child + li a:before{content:"2"}
.popular-posts ul li:first-child a:before{content:"1"}
After adding the code save your template. Your are done now. Now you and your visitors can see this cool Popular Post widget on your blog.