I am afraid that the design-time limitations are still present with the PageLayout.
Generally, the Design time uses an engine similar to a very old version of Internet Explorer and it not all styles and HTML elements are rendered properly in it. That is why, sometimes some of the styles are not reflected in the design-time while they are applied in the real browser.
We strongly recommend testing such appearance tasks in the real browser. In the modern browsers, such as Google Chrome and Mozilla Firefox, the developer tools provided by the browser allow a very easy inspection and tweaking of CSS styles, HTML attributes and DOM elements hierarchy. More info can be found in the following blog post, mainly the first two points:
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