Hello,
We have run the following script using phpdocx 5.5:
$docx = new CreateDocx();
$docx->embedHTML('
<html>
<head>
</head>
<body style="color: red">
<p>This is a test.</p>
<p>Another test which must be separated in a specific paragraph.</p>
<p>And another</p>
</body>
</html>');
$docx->createDocx('output.docx');
And the color is applied correctly to all paragraphs. As you are using a template maybe it has some custom style or any other content that is overwriting the new contents/styles. We recommend you to check your template.
Regards.