demo-styles.css

body, html
{
    height: 100%;
    width: 100%;
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 0;
}

#card
{
    height: 100%;
}

/* body {
    margin: 1em;
    padding: 0;
    font-family: Google Sans, Noto, Roboto, Helvetica Neue, sans-serif;
    color: #244376;
  } */
  
  
  /* #card {
    margin: 3em auto;
    display: flex;
    flex-direction: column;
    max-width: 600px;
    border-radius: 6px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
    overflow: hidden;
  } */

  
  model-viewer {
    width: 100%;
    /* height: 400px; */
    height: 100%;
    background-color: #70BCD1;
    --poster-color: #ffffff00;
  }
  
  .attribution {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin: 1em;
  }
  
  .attribution h1 {
    margin: 0 0 0.25em;
  }
  
  .attribution img {
    opacity: 0.5;
    height: 2em;
  }
  
  .attribution .cc {
    flex-shrink: 0;
    text-decoration: none;
  }
  
  footer {
    display: flex;
    flex-direction: column;
    max-width: 600px;
    margin: auto;
    text-align: center;
    font-style: italic;
    line-height: 1.5em;
  }