Add the class to the div you want to be scrollable.
overflow-x: hidden; hides the horizantal scrollbar. While overflow-y: scroll; allows you to scroll vertically.
<!DOCTYPE html>
<html>
<head>
<style>
.scroll {
width: 500px;
height: 300px;
overflow-x: hidden;
overflow-y: scroll;
}
</style>
</head>
<body>
<div class="scroll"><h1> DATA </h1></div>