CSS Inline styles
Use inline styles to apply styling to a specific element. Note that this is not optimal. Placing style rules in a <style> tag or external CSS file is encouraged in order to maintain a distinction between content and presentation.Inline styles override any CSS in a <style> tag or external style sheet. While this can be useful in some circumstances, this fact more often than not reduces a project's maintainability. The styles in the following example apply directly to the elements to which they are attached.
Inline styles are generally the safest way to ensure rendering compatibility across various email clients, programs and devices, but can be time-consuming to write and a bit challenging to manage.