Messy emails in Microsoft Outlook

Hi.

I have a issue I have studied for several days without finding a great solution.

All emails sent from Ultimate Member to new members and webmaster (from wp-content/plugins/ultimate-member/templates/email) looks great if the recipient are using Gmail.

Picture of Gmail email:
https://ksmedia.no/cocacolaclub_no/gmail.png

However, if the recipient use Microsoft Outlook, the emails received looks a bit different.

Picture of Microsoft Outlook email:
https://ksmedia.no/cocacolaclub_no/Microsoft-Outlook.png

How can I code the source in the email templates to show in Outlook as they do in Gmail. The emails look a bit messy and not so professional in Outlook. ??

Pictures of the email template resetpw_email.php in admin:
https://ksmedia.no/cocacolaclub_no/UM-email-template-resetpw_email-1.png
https://ksmedia.no/cocacolaclub_no/UM-email-template-resetpw_email-2.png

Thanks,

NorSubs