#checkbox1 + .checkbox-label {
  /*box-shadow*/
  -webkit-box-shadow: inset 0 0 0 0px rgba(19,191,17,1), 0 0 0 2px #dddddd;
  -moz-box-shadow: inset 0 0 0 0px rgba(19,191,17,1), 0 0 0 2px #dddddd;
  box-shadow: inset 0 0 0 0px rgba(19,191,17,1), 0 0 0 2px #dddddd;
}
#checkbox1:checked + .checkbox-label {
  /*box-shadow*/
  -webkit-box-shadow: inset 0 0 0 18px rgba(19,191,17,1), 0 0 0 2px rgba(19,191,17,1);
  -moz-box-shadow: inset 0 0 0 18px rgba(19,191,17,1), 0 0 0 2px rgba(19,191,17,1);
  box-shadow: inset 0 0 0 18px rgba(19,191,17,1), 0 0 0 2px rgba(19,191,17,1);
}
#checkbox1:checked + .checkbox-label:after { color: rgba(19,191,17,1); }