.SuiCheckbox__input input:checked + span::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 0px;
  border: solid #333;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.SuiCheckbox__input:checked ~ .SuiCheckbox__checkbox .SuiCheckbox__indicator::before {
    background-color: transparent;
}