Ciao, devi usare il custom-control piu una modifica al foglio di style.
codice:
.custom-control-input:checked~.custom-control-label::before {
border:0;
background-color: red;
}
codice HTML:
<div class="custom-control custom-radio custom-control-inline">
<input type="radio" id="radio1" class="custom-control-input" name="radio" value="radio1" checked>
<label class="custom-control-label" for="radio1">Radio 1</label>
</div>
<div class="custom-control custom-radio custom-control-inline">
<input type="radio" id="radio2" class="custom-control-input" name="radio" value="radio2">
<label class="custom-control-label" for="radio2">Radio 2</label>
</div>