bootstrap 3 grouped table rows
<!DOCTYPE html>
<html>
<head>
<title>Splitting List Into Columns</title>
<link rel="stylesheet" href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
integrity=
"sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
crossorigin="anonymous" />
<style type="text/css">
.col-12 {
background-color: lightgreen;
border: 1px solid black;
}
</style>
</head>
<body>
<div class="container">
<h1 class="text-center display-4">Column</h1>
<div class="col-12">Row 1</div>
<div class="col-12">Row 2</div>
<div class="col-12">Row 3</div>
<div class="col-12">Row 4</div>
</div>
</body>
</html>