Enqueued css not applied. | WordPress.org

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Here is my code:

home.php

<div class="test-class">
    test text
</div>

functions.php

<?php
function blabla() {
wp_enqueue_style( 'homepage', './homepage.css' );
}
add_action( 'wp_enqueue_scripts', 'blabla' );
?>

homepage.css

#test-class {
    color: red;
}

All the files are in the root folder of the theme.

I don’t understand why the css is not enqueued. (The text in the div has no red color).