header {
  height: 750px;
  background: url(../img/bg_download.jpg) center center no-repeat;
  background-size: cover;
}
@media (max-width: 767px) {
  header {
    height: 650px;
  }
}
.btn-outline:hover,
.btn-outline:focus,
.btn-outline:active {
  color: #0983aa;
}

/* 高速下载按钮 */
.btn-high{
  margin-top: 15px;
  border: solid 2px #409EFF;
  font-size: 20px;
  color: #fff;
  background: 0 0;
  background-color: #409EFF;
  transition: all 0.3s ease-in-out;
}
.btn-high:hover,
.btn-high:focus,
.btn-high:active {
  color: #409EFF;
  border: solid 2px #409EFF;
  background-color: #fff;
}

/* app介绍 */
.app_introduce .row {
  margin: 20px 0;
}
.app_introduce h2 {
  font-size: 30px;
}
.app_introduce .col-md-4 {
  background-color: floralwhite;
}
@media (min-width: 767px) {
  .app_introduce .col-md-8 {
    padding-left: 80px;
  }
}
.app_introduce img {
  width: 100%;
  border-radius: 20px;
}
.app_introduce p {
  font-size: 20px;
  text-indent: 40px;
}
@media (max-width: 767px) {
  .app_introduce h3 {
    text-align: center;
  }
}

section.success {
  background: #0983aa;
}

/* 页脚 */
.text-center a {
  color: #fff;
}