Email template with html tags

[#1]

 Hi All, 

How to create email template with html styles in AEM forms,

I tried with below code but its displaying html tags on mail content instead of styles i have applied.

Hi ${first_name} ${last_name},

<b>This is sample template</b>

[#2]

have you looked at this documentation?

https://helpx.adobe.com/aem-forms/6/form-submission-receipt-via-email.html#main-pars_header_2