body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f4;
  }

  .close-btn {
    float: right;
    cursor: pointer;
  }

  #overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    /* 90% opacity black overlay */
    z-index: 9999;
  }


  #popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    background-color: #fff;
    border: 1px solid #ccc;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 80%;
    border-radius: 8px;
    text-align: center;
    z-index: 99999;
  }

  #popup h2 {
    color: #333;
  }

  #popup p {
    color: #666;
  }

  #subscribe-btn {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  #subscribe-btn:hover {
    background-color: #45a049;
  }

  .subscription {
    position: relative;
    width: 100%;
    height: 100%;
  }

  .subscription .add-email {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 0 20px;
  }

  .subscription .submit-email {
    position: absolute;
    top: 0;
    right: 0;
    height: calc(100% - 2px);
    width: 100px;
    border: none;
    border-radius: 60px;
    outline: none;
    margin: 1px;
    padding: 0 20px;
    cursor: pointer;
    background: #4ABEBB;
    color: #FFFFFF;
    transition: width .35s ease-in-out,
      background .35s ease-in-out;
  }

  .subscription.done .submit-email {
    width: calc(100% - 2px);
    background: #C0E02E;
  }

  .subscription .submit-email .before-submit,
  .subscription .submit-email .after-submit {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 38px;
    transition: visibility .35s ease-in-out,
      opacity .35s ease-in-out;
  }

  .subscription.done .submit-email .before-submit,
  .subscription:not(.done) .submit-email .after-submit {
    visibility: hidden;
    opacity: 0;
  }

  .subscription .submit-email .after-submit {
    transition-delay: .35s;
  }

  .subscription:not(.done) .submit-email .before-submit,
  .subscription.done .submit-email .after-submit {
    visibility: visible;
    opacity: 1;
  }

  .popup-content {
    width: 360px;
    height: 40px;
    box-shadow: 2px 4px 10px rgba(0, 0, 0, .2);
    border-radius: 60px;
    overflow: hidden;
  }