checkbox work like radio button code example
Example: checkbox as radio button
input[type=checkbox]:not(old) + label,
input[type=radio ]:not(old) + label{
display : inline-block;
margin-left : -2em;
line-height : 4em;
}
input[type=checkbox]:not(old) + label,
input[type=radio ]:not(old) + label{
display : inline-block;
margin-left : -2em;
line-height : 4em;
}