<div id="m1">
  <div>jQuery</div>
</div>
<div id="m2">
  <div>html</div>
  <div>css</div>
  <div>javascript</div>
</div>

* {
  margin: 0;
  padding: 0;
}
#m2 {
  text-align: center;
}
.box {
  border-bottom: 2px solid #ccc;
  text-align: center;
  padding: 20px;
  margin-bottom: 10px;
}
.circle0,
.circle1,
.circle2 {
  width: 200px;
  height: 200px;
  border-radius: 100px;
  border: 4px solid #ff6600;
  line-height: 200px;
  display: inline-block;
}

$(document).ready(function() {
  $("#m1 > div").addClass("box");
  $("#m2 > div").addClass(function(index) {
    return "circle" + index;
  });
});