Different CSS questions

Dear Enfold Team

I am trying to learn myself CSS – and I’m struggling a bit :-). I try to make the solutions look correct in the inspector tool before I add my solutions to the quick CSS. My site is here: https://stegemueller.dk/ Here it goes:

1) In the blog grid I would like to set the titles to have “letter-spacing: -1;” and I write this code:

.slide-entry-title {
letter-spacing: -1px;
}

I must do something wrong – but what. It works in the inspector tool

2) I would like to style the special headings with a slight shadow in this colour: #627695 so I write this code:

.av-special-heading-tag {
text-shadow: 2px 2px 2px rgba(98,118,149,0.6);
}

But I can’t see it on my site.

Obviously I must do something wrong, so I hope you can help me.

Best regards,
Hanne,
Denmark