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Consider defining a CSS class and assigning this class to all the elements that need to be formatted.
template.css
.MyEmailStyle {
font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif;
font-size: 14px;
line-height: 1.6em;
font-weight: normal;
margin: 10px 0 10px;
padding: 0;
}
main.html
<p class="MyEmailStyle">
Hello John
</p>
As you can’t include external or internal CSS files in an email template, consider using this library.
Source:stackexchange.com