.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;
  z-index:11000;
}

.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup_nn {
  margin: 70px auto;
  padding: 30px;
  background: white;
  border-radius: 5px;
  width: 700px;
  position: relative;
}

.popup_nn .close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}

.popup_nn .close:hover {
  color: #06D85F;
}

.popup_nn .content {
  max-height: 30%;
  overflow: auto;
}

.link_nn {
    color:#002b7d;
    font-weight:bold;
    text-decoration:none;
}

.button_nn {
    background-color: #FF4500;
    border: none;
    color: white;
    padding: 10px 24px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 18px;
    margin: 4px 2px;
    cursor: pointer;
}

@media screen and (max-width: 900px){
    .box{
        width: 70%;
    }
    .popup{
        width: 70%;
    }
}