.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  /*transition: opacity 500ms;*/
  visibility: hidden;
  opacity: 0;
  overflow: auto;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 70px auto;
  padding: 20px;
  background: #ececec;
  border-radius: 5px;
  max-width: 25%;
  position: relative;
  /*transition: all 5s ease-in-out;*/
  overflow-x: hidden;
  overflow-y: auto;
  min-height: 100px;
  /*max-height: 250px;*/
  color: black;
font-family: arial;
}


.popup h2 {
  margin-top: 5px;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
  position: absolute;
  top: 10px;
  right: 10px;
  /*transition: all 200ms;*/
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #1f554d;
  opacity: 1.0 !important;
}
.popup .close:hover {
  color: #ff0606;
}
.popup .content {
  max-height: 30%;
  overflow: auto;
}

@media screen and (max-width: 700px){
  .box{
    width: 70%;
  }
  .popup{
    max-width: 80%;
  }
}