I was using Notion earlier but it was hard to track finances etc so for Domestic clients I use Zoho Invoices & for International, I use Pipedrive + Asana for tasks.
Hey 脕d谩m S.Aurelien S. Here's my Explanation & Preview Link to Copy the Code 馃殌Preview LinkWebflow Link
TLDR:
Add a span with class underline in heading, keep the span position relative, add the CSS ::after Property to add width & position variables.
Text Shadow is optional if you want to do that line going under the text thing. since you need to adjust that in responsive viewports!