The problem is that the page is looking for the assets in /premium/css/style.css where they are obviously not present
What you’re missing is a single slash /.
Instead of:
<link rel="stylesheet" type="text/css" th:href="@{css/style.css}">
…please do:
<link rel="stylesheet" type="text/css" th:href="@{/css/style.css}">
As stated in Thymeleaf’s documentation:
Relative URLs starting with
/(eg:/order/details) will be automatically prefixed by the application context name.
That way your link will be relative to application context (http://domain/) and will point to proper folder.
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