Pada konfigurasi widget Posting Populer, pastikan bahwa Anda memilih model widget berupa thumbnail dan judul. Setelah itu masuk ke editor HTML template. Salin kode CSS ini dan letakkan di atas kode ]]></b:skin> atau </style>:

/* Custom CSS for Blogger Popular Post Widget */
.PopularPosts ul,
.PopularPosts li,
.PopularPosts li img,
.PopularPosts li a,
.PopularPosts li a img {
  margin:0 0;
  padding:0 0;
  list-style:none;
  border:none;
  background:none;
  outline:none;
}

.PopularPosts ul {
  margin:.5em 0;
  list-style:none;
  font:normal normal 13px/1.4 "Arial Narrow",Arial,Sans-Serif;
  color:black;
  counter-reset:num;
}

.PopularPosts ul li img {
  display:block;
  margin:0 .5em 0 0;
  width:50px;
  height:50px;
  float:left;
}

.PopularPosts ul li {
  background-color:#eee;
  margin:0 10% .4em 0;
  padding:.5em 1.5em .5em .5em;
  counter-increment:num;
  position:relative;
}

.PopularPosts ul li:before,
.PopularPosts ul li .item-title a {
  font-weight:bold;
  font-size:120%;
  color:inherit;
  text-decoration:none;
}

.PopularPosts ul li:before {
  content:counter(num);
  display:block;
  position:absolute;
  background-color:black;
  color:white;
  width:30px;
  height:30px;
  line-height:30px;
  text-align:center;
  top:50%;
  right:-10px;
  margin-top:-15px;
  -webkit-border-radius:30px;
  -moz-border-radius:30px;
  border-radius:30px;
}

/* Set color and level */
.PopularPosts ul li:nth-child(1) {background-color:#E11E28;margin-right:1%}
.PopularPosts ul li:nth-child(2) {background-color:#FD3C03;margin-right:2%}
.PopularPosts ul li:nth-child(3) {background-color:#FECB09;margin-right:3%}
.PopularPosts ul li:nth-child(4) {background-color:#6EBE27;margin-right:4%}
.PopularPosts ul li:nth-child(5) {background-color:#149A48;margin-right:5%}
.PopularPosts ul li:nth-child(6) {background-color:#5BBFF1;margin-right:6%}
.PopularPosts ul li:nth-child(7) {background-color:#61469C;margin-right:7%}
.PopularPosts ul li:nth-child(8) {background-color:#863E86;margin-right:8%}
.PopularPosts ul li:nth-child(9) {background-color:#863E62;margin-right:9%}
.PopularPosts ul li:nth-child(10) {background-color:#815540;margin-right:10%}

Klik Simpan Template. Begitu saja.