.umbraco-forms-form input[type="checkbox"] {
    width: 12px;
    height: 12px;
    float: left;
    -webkit-border-radius: 2px;
    border-radius: 2px;
    margin-right: 5px;
    padding: 0;
    background: #F2F2F2;
    position: relative; 
}

.umbraco-forms-form .form-check .form-check-label,
.form-group.dataconsent .consent-label {
    width: 90%; 
}