.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: 4;
  }
  .overlay:target {
    visibility: visible;
    opacity: 1;
  }
  
  .popup {
    margin: 150px auto;
    padding: 20px;
    background: #fff;
    border-radius: 5px;
    width: 50%;
    position: relative;
    transition: all 5s ease-in-out;
  }
  
  .popup h2 {
    margin-top: 0;
    color: #333;
    font-family: Tahoma, Arial, sans-serif;
  }
  .popup .close {
    position: absolute;
    top: 20px;
    right: 30px;
    transition: all 200ms;
    font-size: 30px;
    font-weight: bold;
    text-decoration: none;
    color: #333;
  }
  .popup .close:hover {
    color: #06D85F;
  }
  .popup .content {
    max-height: 50%;
    overflow: auto;
    font-family: verdana;
  }
  
  @media (max-width:450px) {
      .popup {
          width:80%;
      }
      .content {
          width: 90%;
      }
  }