.gt-checkbox input[type="checkbox"]:not(:checked) + span:before, .gt-checkbox input[type="checkbox"]:checked + span:before, .gt-checkbox[type="checkbox"]:not(:checked) + .gt-checkbox-label:before, .gt-checkbox[type="checkbox"]:checked + .gt-checkbox-label:before {
    border: 1px solid #333333;
    background: #fff;
}