* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
img {
  max-width: 100%;
}

body {
  text-align: center;
  font-size: 16px;
  font-family: PingFang SC, Microsoft Yahei, Lato, Helvetica Neue, Arial, SimSun,
    Helvetica, STHeiTi, Roboto Regular, Roboto, Droid Sans, sans-serif;
  color: #333;
}

a {
  color: #666;
  text-decoration: none;
}

li {
  list-style: none;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  text-align: center;
}

.container h2 {
  font-size: 100%;
  font-weight: 400;
}

.footer {
  padding: 42px;
  line-height: 36px;
  color: #888;
  background: #f3f4f6;
}

.content {
  margin: 0 auto;
}

.content {
  max-width: 1280px;
  margin: 75px auto 150px;
}

.content .part {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  overflow: hidden;
}

.content .part .pic-box {
  width: 600px;
  height: 400px;
  vertical-align: middle;
  -webkit-transform: translateY(100%);
  -ms-transform: translateY(100%);
  transform: translateY(100%);
  opacity: 0;
}

.content .part .pic-box > img {
  width: 600px;
  margin: 0 auto;
}

.content .part .animated {
  -webkit-transform: translateY(0);
  -ms-transform: translateY(0);
  transform: translateY(0);
  opacity: 1;
  -webkit-animation-name: fadeIn;
  animation-name: fadeIn;
  -webkit-animation-duration: 0.5s;
  animation-duration: 0.5s;
}

.content .part .txt-box {
  width: 480px;
}

.content .part .txt-box .title-tip {
  color: #91949f;
  font-size: 15px;
  line-height: 20px;
}

.content .part .txt-box .title-main {
  margin-bottom: 10px;
  color: #252631;
  font-size: 44px;
  line-height: 62px;
}

.content .part .txt-box .title-sub {
  color: #66676e;
  font-size: 22px;
  line-height: 30px;
}

.content .part .txt-box .title-txt {
  color: #66676e;
  font-size: 15px;
  line-height: 25px;
}

.content .part:nth-of-type(odd) .pic-box {
  float: left;
  margin-right: 200px;
}

.content .part:nth-of-type(2n) {
  -webkit-box-orient: horizontal;
  -webkit-box-direction: reverse;
  -webkit-flex-direction: row-reverse;
  -ms-flex-direction: row-reverse;
  flex-direction: row-reverse;
}

.content .part:nth-of-type(2n) .txt-box {
  margin-right: 120px;
}

@media screen and (max-width: 1300px) {
  .content {
    width: 1200px;
  }

  .content .part:nth-of-type(odd) .pic-box {
    margin-right: 120px;
  }

  .content .part:nth-of-type(2n) .txt-box {
    margin-right: 50px;
  }
}