flexbox

Hey, awesome work on this one. Layout in general looks fine.

Some suggestions would be:

• Always have a main element that will wrap the whole main content of the webpage. main elements helps users to properly navigate your content.
• You don't have to use margin just to center the card properly. What you could have done is, on the .contenador selector, use min-height: 100vh on it. Then just remove the margin on the .tarjeta selector. This way, your content will always be centered dynamically.
• The alt for the card wave image should have been using alt="" on it, since it is only decoration. If an image acts just as a decoration, use alt="" on it, but if the image adds content, then use a meaningful alt value.
• The name of the person should have been a heading tag like h1 or h2.
• The information below could have used ul element, since those are "list" of information about the user.

Just those mentioned, really great job on this one.

nice