how to add custom html and css in wordpress
/* I have just tried running your code on a fresh WordPress install with
the Neve theme installed. Its all working correctly, except do not use .
container as a class for the flex box, instead use something like .
container-flex.
.container is already assigned to some HTML in the Neve theme.
I was unable to gain access to the site you want to use this on. But if you
just need to add this onto a page, use the Custom HTML block, paste in your
HTML code and save the page. */
<span> <div class ="container-flex">
<div class ="box-zeeland" > Zeeland </div>
<div class ="box-normandie" > Normandy </div>
<div class ="box-roffa" > Rotterdam </div>
<div class ="box-Valencia" > Valencia </div>
<div class ="box-Adam" > Amsterdam </div>
<div class ="overlay" > </div>
</div>
</span>
/* Then click on Customize > Additional CSS, and paste your CSS code in there
and click Publish. Then your code should work as intended.*/