.captcha-image {
border: 1px solid #ddd;
padding: 10px;
display: inline-block;
text-align: center;
margin-bottom: 15px;
}
.captcha-image p span {
color: red;
font-weight: bold;
}
.captcha-image i {
padding: 5px;
font-size: 40px
}
.captcha-image label {
display: inline-block;
}
.captcha-image label > input{ display:none;
}
.captcha-image label > input + i{ cursor:pointer;
border:2px solid transparent;
}
.captcha-image label > input:checked + i{ border:2px solid #f00;
}