Hi @IVergara , I see that in the preview the class "responsiveText" is not set in the H2. Could you add that so we can do some testing? Two things that should help:
Add the hs-inline-css ID to the <style> tag, this should help with cross client compatibility.
Increase your media query to 375px or higher. Currently, your query will skip some mobile devices.
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Email client do not support a range of size formats, but vw unit size would be create. But since the support is bad, I recommand setting up a fallback.
Since outlook is one of the most populair email client I recommand checking unit sizes of css styling at caniemail before using it.
In my opinion the easiest way to create a great responsive looking header is setting up an image with text. This will automatically be resonsive since it will resize to the clients width.