Input
You can reference Bootstrap for form control documentation, but here are some basics.
HTML
<input type="text" class="form-control" id="exampleFormControlInput1" placeholder="Form Control Input">HTML
<input class="form-control form-control-lg" type="text" placeholder=".form-control-lg" aria-label=".form-control-lg example">HTML
<input class="form-control" type="text" placeholder="Default input" aria-label="default input example">HTML
<input class="form-control form-control-sm" type="text" placeholder=".form-control-sm" aria-label=".form-control-sm example">