.modal {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  display: none;
  z-index: 9000;
  overflow: hidden;
  color: #000;
  background: rgba(0, 0, 0, 0.2);
}
.modal.show {
  display: block;
}
.modal section {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  position: absolute;
  top: 50%;
  left: 50%;
  height: auto;
  width: auto;
  max-width: 100%;
  max-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}