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ADDED CSS CODE : 
input[type='radio']:focus+label {
    display: block;
    border-width: 1px;
    margin: 1px 0;
    background-color: #ccc;
}
input[type='radio']:focus+label:after {
    content: '?';
}
input[type='radio']:focus:checked+label {
    margin: 0;
}
input[type='radio']:focus:checked+label:after {
    content: '';
}