Use the [attribute$=”value”] selector to select elements whose attribute value ends with a specified value i.e. “.htm” here.
You can try to run the following code to implement the CSS [attribute$="value"] Selector,
Example
<!DOCTYPE html>
<html>
<head>
<style>
[href$ = htm] {
border: 5px solid orange;
border-radius: 5px;
}
</style>
</head>
<body>
<a href = "https://tutorialspoint.com/java/index.htm">Java Tutorial</a>
<a href = "https://www.tutorialspoint.com/java/java_tutorial.pdf">Java Tutorial PDF</a>
</body>
</html>