.modal {opacity: 0;visibility: hidden;position: fixed;top: 0;right: 0;bottom: 0;left: 0;text-align: left;background: rgba(0,0,0, .9);transition: opacity .25s ease}
.modal__bg {position: absolute;top: 0;right: 0;bottom: 0;left: 0;cursor: pointer}
.modal-state {display: none}
.modal-state:checked + .modal {opacity: 1;visibility: visible;}
.modal-state:checked + .modal .modal__inner {top: 0;font-size: 16px;}
.modal__inner {transition: top .25s ease;position: absolute;top: -20%;right: 0;bottom: 0;left: 0;width: 50%;margin: auto;overflow: auto;background: #fff;border-radius: 5px;padding: 1em 2em;height: 90%;}
.modal__close {position: absolute;right: 1em;top: 1em;width: 1.1em;height: 1.1em;cursor: pointer;}
.modal__close:after,
.modal__close:before {content: '';position: absolute;width: 2px;height: 1.5em;background: #ccc;display: block;transform: rotate(45deg);left: 50%;margin: -3px 0 0 -1px;top: 0;}
.modal__close:hover:after,
.modal__close:hover:before {background: #aaa;}
.modal__close:before {transform: rotate(-45deg);}
.modal-state:checked + .modal{z-index: 9999;}
.modal__inner h2 {margin: 8px 0;}

@media screen and (max-width: 768px) {
  .modal__inner {width: 90%;height: 90%;box-sizing: border-box}
}