The only exception to this is if you need to include media queries to make your elements responsive on mobile, for example:
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<style> @media only screen and (max-width:600px) { .a-unique-class { ... } } </style> <div class="a-unique-class"> ... </div>
Include target=_blank to all links
Use the full path URL for all links to ensure they can be opened
In most cases, you shouldn’t apply a background color to your plugin (unless the user is able to customize it). This is because the user might be using a custom background color on their email. By not applying a background color, your element’s background will automatically be the same as their email.