body {
  font-family: sans-serif;
  max-width: 800px;
  margin: auto;
}

.ps-modal {
    /* This way it could be display flex or grid or whatever also. */
    display: block;
    
    /* Probably need media queries here */
    width: 600px;
    max-width: 100%;
    
    height: 400px;
    max-height: 100%;
    
    position: fixed;
    
    z-index: 100;
    
    left: 50%;
    top: 50%;
    
    transform: translate(-50%, -50%);
    
    /* If known, negative margins are probably better (less chance of blurry text). */
    /* margin: -200px 0 0 -200px; */
    
    background: white;
    box-shadow: 0 0 60px 10px rgba(0, 0, 0, 0.9);
  }

  .guts {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    padding: 20px 50px 20px 20px;
  }

  .guts ul {
    position: absolute;
    bottom: 50px;
    margin: 0 auto;
    width: 400px;
    left: 100px;
    padding: 0 0;
  }

  .guts ul li {
    list-style: none;
  }
  
  .ps-closed {
    display: none;
  }
  
  .ps-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 50;
    
    background: rgba(0, 0, 0, 0.6);
  }

  .ps-btn {
    text-decoration: none;
    color: #fff;
    background-color: #7bd317;
    text-align: center;
    letter-spacing: 1px;
    cursor: pointer;
    user-select: none;
    
    border: none;
    border-radius: 10px;
    display: block;
    height: 44px;
    line-height: 44px;
    font-size: 22px;
    outline: 0;
    padding: 0 2rem;
    text-transform: uppercase;

    margin-top: 30px;
    margin-bottom: 10px;
    width: 100%;
}
