.modal-window {
    position: fixed;
    background-color: rgba(255, 255, 255, 0.25);
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 999;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
  }
  .modal-window:target {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
  }
  .modal-window > div {
    width: 85%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 2em;
    background: white;
  }
  .modal-window header {
    font-weight: bold;
  }
  .modal-window h1 {
    font-size: 150%;
    margin: 0 0 15px;
  }
  
  .modal-close {
    color: #BD2424;
    line-height: 45px;
    font-size: 100%;
    position: absolute;
    right: 0;
    text-align: center;
    top: 0;
    width: 70px;
    text-decoration: none;
  }
  .modal-close:hover {
    color: black;
  }
  
  /* Demo Styles */
  html,
  body {
    height: 100%;
  }
  
  html {
    font-size: 18px;
    line-height: 1.4;
  }
  
  body {
    font-family: apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    font-weight: 600;
    background-image: linear-gradient(to right, #7f53ac 0, #657ced 100%);
    color: black;
  }
  
  a {
    color: inherit;
    text-decoration: none;
  }
  
  .container {
    display: grid;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .modal-window > div {
    border-radius: 1rem;
  }
  
  .modal-window div:not(:last-of-type) {
    margin-bottom: 15px;
  }
  
  .logo {
    max-width: 150px;
    display: block;
  }
  
  small {
    color: lightgray;
  }
  
  .btn {
    background-color: white;
    padding: 1em 1.5em;
    border-radius: 0.5rem;
    text-decoration: none;
  }
  .btn i {
    padding-right: 0.3em;
  }