.thunderbird {
  &.thank-you-page,
  &.share-page {
    display: block;
  }
  background: #EAEFF2;
  background: -ms-radial-gradient(center,ellipse cover,#eaeff2 0,rgba(212,221,228,0.5) 60%),-ms-linear-gradient(top,#cae1f4 0,rgba(125,185,232,0) 100%);
  background: radial-gradient(ellipse at center,#eaeff2 0,rgba(212,221,228,0.5) 50%),linear-gradient(to bottom,#cae1f4 0,rgba(125,185,232,0) 100%);
  .internet-graphic {
    margin-bottom: 10px;
  }
  .additional-info-page {
    background: #F6F8F9;
  }
  .header {
    margin: 10px auto 0;
    h1 {
      text-align: center;
    }
    img {
      max-width: 280px;
    }
    .tb-logo {
      margin-bottom: -30px;
      max-width: 280px;
    }
  }
  .submit-btn {
    background-color: #3D99F9;
    &:hover {
      background-color: #53A0F0;
    }
  }
  .disclaimers {
    padding: 0 5px;
    margin: 0 auto;
    border-radius: 0;
    background: transparent;
    p {
      color: #999;
      font-size: 12px;
      line-height: normal;
    }
  }
}

.thunderbird {
  &.thank-you-page,
  &.share-page {
    display: block;
  }
  .internet-graphic {
    margin-bottom: 10px;
  }
  .additional-info-page {
    background: #EAEFF2;
  }
  .header {
    margin: 10px auto 0;
    h1 {
      text-align: center;
    }
    img {
      max-width: 280px;
    }
    .tb-logo {
      margin-bottom: -30px;
      max-width: 280px;
    }
  }
  .submit-btn {
    background-color: #3D99F9;
    &:hover {
      background-color: #53A0F0;
    }
  }
}

Align the Thunderbird looks (colors, bg) with current general Mozilla looks.
Align the Thunderbird looks (colors, bg) with current general Mozilla looks.
