signature in Thunderbird

Dear Mozilla community I would like to ask the following question. I have created a signature template in Word, but it is saved in htm format. I have added some small icons that are hyperlinked to my social media platforms (X, Facebook, etc.). The hyperlinks work fine in Word or htm, but when I put the file in my Thunderbird signature, the signature does not load properly and the icons are not displayed or linked. How can I fix this? I have attached some pictures of the signature Thank you for your attention. Best regards. Sincerely, Luis