when literally copy pasting this from bootstrap 4:
<div class="form-group has-danger">
<label class="form-control-label" for="inputDanger1">Input with danger</label>
<input type="text" class="form-control form-control-danger" id="inputDanger1">
<div class="form-control-feedback">Sorry, that username's taken. Try another?</div>
<small class="form-text text-muted">Example help text that remains unchanged.</small>
</div>
Getting this with alpha 4 and alpha 5.
Maybe it's because I'm using flatkit and laravel/blade?
So apparently there was a file called app.css included in the public/css folder AND an app.css file included in the /assets/styles/ folder. By removing the first one it works like a charm. The second was probably a default css file made by laravel, it said bootstrap 3 in the comments so this one was definitely the culprit. Sorry for wasting your time folks :s