[openstreetmap/openstreetmap-website] fix welcome message (#2537)

[Anton]

> We're trying to move away from having custom css, and in particular custom header sizes, so I'm not keen on this solution.

OK.


> How does this message compare with the other sidebars that have a header and a close icon? 
Does the same problem appear there? 

not testing.

> Should the positioning of the close icon be improved or use a different approach?

need use different position type, all elements need one flow, and remove all position absolute
https://getbootstrap.com/docs/4.0/components/modal/#modal-components good example 



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