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.
<h1 style="color: green; text-decoration: underline;">Hello world!</h1>
<p style="font-size: 25px; font-family: 'Trebuchet MS';">I ♥ CSS</p>
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.