span.cloze {
    font-weight: 600;
    color: #008007;
}

span.cloze input {
    display: none;
}

span.cloze input:checked+label {
    display: none;
}

span.cloze input:checked+label+label {
    display: unset;
}

span.cloze input+label {
    cursor: zoom-in;
}

span.cloze input+label+label {
    display: none;
    cursor: zoom-out;
}