I have a page called index.php

```
<html>
<head>
<link rel="stylesheet" type="text/css" href="mystyle.css" />
...
<body>
<div class="my_class"></div>
...
</body>
</html>

```

In `mystyle.css` there is no declaration for `.my_class`
I have another file called external\_style.css where there is no declaration for `.my_class` either but there is a class called `.new_class`

Can not import or append external\_style.css - cause it will overwrite other elements.

My question is:
How can I get the properties of .new\_class from external\_style.css into `.my_class` without importing the file.
Is there a way to read that file using php?
Is there another better solution?