.modal label > input{ /* HIDE RADIO */
  visibility: hidden; /* Makes input not-clickable */
  position: absolute; /* Remove input from document flow */
}
.modal label > input + img{ /* IMAGE STYLES */
  cursor:pointer;
  padding:10px;
  border:4px solid transparent;
}
.modal label > input:checked + img{ /* (RADIO CHECKED) IMAGE STYLES */
  padding:10px;
  border:4px solid #f15f22;
}