CSS suggestions don't show up - ide

Question

I am currently working in PhpStorm and closed the project yesterday evening as usual, as well as started it as usual today.
But now when I type CSS code I don't get any recommendations / auto completion suggestions.
The only difference is that I have a new keyboard today, everything else is the same as yesterday.
Edit:
Here is a screenshot as requested:
It doesn't work in one specific file, in the other files it is working fine, here is the file where it doesn't work:
#extends('layouts.app')
#section('content')
<div class="flex justify-center ">
<div class="w-11/12 bg-gray-400 p-6 rounded-lg font-serif text-4xl font-bold bg-opacity-70 subpixel-antialiased tracking-wide not-italic">
<div class="p-10 shadow-2xl mb-10 bg-gradient-to-r from-green-400 to-blue-500 border-solid border-2 border-black rounded-lg">
<div class="bg-gray-100 shadow-2xl border-solid border-2 border-gray-500 rounded-lg">
<h1 class="pt-2 pl-4 text-4xl font-bold text-gray-900 title-font mb-8 underline">
{{ $post->Titel }}
</h1>
<div class="flex-grow">
<div>
<div class="pt-2 pl-4 pb-3 ml-8 font-medium text-base font-bold font-serif"> Standort: {{ $post->Standort }}</div>
<div class="pt-2 pl-4 pb-3 ml-8 font-medium text-base font-bold font-serif"> Kontakt: {{ $post->Kontakt }}</div>
<div class="pt-2 pl-4 pb-3 ml-8 font-medium text-base font-bold font-serif"> Startdatum: {{ $post->startdate }}</div>
<div class="pt-2 pl-4 pb-3 ml-8 font-medium text-base font-bold font-serif mb-8"> Enddatum: {{ $post->enddate }}</div>
<div class="flex-grow ml-5 ml-8 mb-5 content md:w-3/4 pr-4 text-lg text-justify tracking-widest leading-loose mr-7 subpixel-antialiased">
{!! $post->Beschreibung !!}
</div>
</div>
</div>
<div class="pt-2 pl-4 mb-2 ml-8 font-medium text-base font-bold font-serif"> Referenzcode: {{ $post->id }}</div>
<div class="flex justify-end font-medium text-base font-bold font-serif mb-5 ml-8 mr-8">
<a href="{{ route('bewerben', $post->id) }}">
<button type="submit" class="text-white px-4 py-3 rounded text-base font-medium
bg-gradient-to-r from-green-400 to-blue-500 float-right shadow transition
duration-500 ease-in-out transform hover:-translate-y-1 hover:scale-100">Direkt bewerben!
</button>
</a>
</div>
</div>
</div>
</div>
</div>
#endsection