You will probably need to read the CSS once at startup and save it to a file somewhere in your deployment folder, and then link to it with the code <link rel="stylesheet" type="text/css" href="style.css"> . How exactly you do this will depend on your environment and the specific web server.
In any case, it is always desirable that CSS be an external resource for a number of reasons, for example. because CSS resources are cached by web browsers as opposed to dynamic pages.
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