body {
  font-size: 16px;
}

.hero {
  width: 100%;
  background-color: #74DCE3;
  height: 700px;
  color: #222;
  margin-bottom: 100px;
}

button {
  margin-top: 0.5em;
  width: 320px;
  font-size: 1.5em;
  text-align: center;
  border-radius: 4px;
  padding: 0.25em;
  border: 0px;
  cursor: pointer;
  box-sizing: border-box;
}

.buy {
  background-color: #F0DB4F;
  border: 4px solid #F0DB4F;
}

.preview {
  background-color: transparent;
  border: 4px solid #ddd;
}

.hero .overview {
  float: left;
  box-sizing: border-box;
  width: 50%;
  padding: 30px;
  padding-top: 200px;
}

.hero .overview h1 {
  text-align: left;
  display: inline-block;
}

.hero .overview div.tagline, .hero .overview div.cta {
  width: 100%;
  display: inline-block;
  text-align: left;
  font-size: 1.25em;
  line-height: 1.5em;
  margin-bottom: 0.5em;
}

.hero .cover {
  float: right;
  text-align: center;
  box-sizing: border-box;
  width: 50%;
  padding: 30px;
}

.hero .cover img {
  height: 640px;
}

.section {
  width: 1000px;
  margin-top: 50px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.25em;
  line-height: 1.75em;
}

.section h2 {
  text-align: center;
}

p, ul, li {
  margin-top: 0.75em;
  margin-bottom: 0.75em;
}

.author-pic {
  float: left;
  width: 30%;
  box-sizing: border-box;
  padding: 50px;
}

.author-bio {
  float: right;
  width: 70%;
  box-sizing: border-box;
  padding: 10px;
}

.sticky-promo {
  position: fixed;
  right: 1em;
  bottom: 1em;
  z-index: 1000;
  padding: 10px;
  width: 200px;
  height: 80px;
  background-color: #fafafa;
  box-shadow: rgba(44, 62, 80, 0.23) 0px 0.4em 0.8em -2px, rgba(102, 119, 136, 0.2) 0px 1px 2px;
}

.sticky-promo .cover {
  float: left;
}

.sticky-promo .cta {
  float: right;
  width: 130px;
  font-size: 0.8em;
}

.sticky-promo .cta h3 {
  font-size: 2em;
  margin-top: 3px;
  margin-bottom: 0.25em;
}

.sticky-promo img {
  height: 80px;
}

.section img {
  width: 100%;
}

.sample-app .app-preview {
  float: left;
  width: 30%;
  box-sizing: border-box;
  padding: 25px;
  padding-top: 0px;
  padding-left: 0px;
}

.sample-app p:first-child {
  margin-top: 0px;
}

.sample-app .app-preview img {
  border: 1px solid #ddd;
}

.sample-app .description {
  float: right;
  width: 70%;
  box-sizing: border-box;
  padding: 10px;
  padding-top: 0px;
}

#purchase .cover {
  float: left;
  width: 50%;
  box-sizing: border-box;
  padding: 25px;
}

#purchase .cover img {
  width: 100%;
}

#purchase .details {
  margin-top: 60px;
  float: right;
  width: 50%;
  box-sizing: border-box;
  border: 1px solid #ddd;
}

#purchase h3 {
  margin-top: 0px;
  background-color: #74DCE3;
  text-align: center;
  padding: 10px;
}

#purchase .price {
  margin: 10px;
  text-align: center;
}

#purchase .small {
  font-size: 0.6em;
  color: #666;
  padding: 10px;
  line-height: 1.25em;
}

.paypal-button {
  text-align: center;
}

.cover-mobile {
  display: none;
}

.sticky-promo-mobile {
  display: none;
}

.hide {
  display: none !important;
}

@media (max-width: 1000px) {
  .hero {
    margin-top: 65px;
  }

  .sticky-promo {
    display: none;
  }

  .hero .overview div.cta {
    text-align: center;
  }

  .sticky-promo-mobile {
    display: block;
    position: fixed;
    bottom: 0px;
    left: 0px;
    width: 100%;
    height: 40px;
    padding: 0px;
    background-color: #F0DB4F;
    border-top: 1px solid #ddd;
    text-align: center;
    overflow: hidden;
  }

  .sticky-promo-mobile a {
    color: #222;
  }

  .sticky-promo-mobile img {
    height: 80px;
    position: relative;
    top: -40px;
  }

  .sticky-promo-mobile div {
    display: inline-block;
    position: relative;
    top: -53px;
    font-size: 1.5em;
    margin-left: 0.5em;
  }

  .hero {
    height: auto;
  }

  .hero .cover {
    display: none;
  }

  .hero .overview {
    width: 100%;
    padding-top: 10px;
  }

  .hero .overview h1, .hero .overview div {
    width: 100%;
    text-align: center;
  }

  .hero .overview div.tagline {
    width: 100%;
    text-align: center;
  }

  .cover-mobile {
    display: block;
    margin-top: 25px;
  }

  .cover-mobile img {
    width: 100%;
  }

  .section {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
  }

  .author .author-pic {
    float: none;
    width: 100%;
    padding: 0px;
  }
  .author .author-bio {
    float: none;
    width: 100%;
    padding: 0px;
  }

  .sample-app .app-preview {
    float: none;
    width: 100%;
    padding: 0px;
  }
  .sample-app .description {
    float: none;
    width: 100%;
    padding: 0px;
  }
  #purchase .cover {
    float: none;
    width: 100%;
    padding: 0px;
  }
  #purchase .details {
    float: none;
    width: 100%;
    padding: 0px;
  }

  ul {
    padding-left: 1em;
  }
}