* {
  margin: 0;
  padding: 0;
}

.header {
  display: flex;
  justify-content: space;
  vertical-align: middle;
  align-items: center;
  color: #333;
  height: 100px;
}

.logo {
  flex: 4;
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo .title {
  font-size: 28px;
} 

.logo img {
  display: block;
  width: 66px;
  height: 66px;
  margin-right: 20px;
  border-radius: 10px;
}

.logo .desc {
  font-size: 16px;
}

.nav {
  flex: 6;
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}

.nav .nav_list li {
  float: left;
  position: relative;
  width: 143px;
  height: 65px;
  line-height: 65px;
  list-style: none;
  text-align: center;
  /* border: 1px solid #ebebeb; */
}

.nav .nav_list li a {
  text-decoration: none;
  color: #333;
}

.main .banner {
  height: auto;
}

.main .banner:nth-child(2n + 1) {
  background: #2F86F6;
}

.main .banner:nth-child(2n + 1) .text{
  color: #fff;
}

.main .banner:nth-child(2n + 1) .content .picture {
  transform: translate(50px);
  opacity: 0;
  transition: all 1s ease 0.4s;
}

.main .banner:nth-child(2n + 1) .content .picture.active {
    transform: translate(0);
    opacity: 1;
  }
  

.main .banner:nth-child(2n + 1) .content .text {
  transform: translate(-50px);
  opacity: 0;
  transition: all 1s ease 0.4s;
}

.main .banner:nth-child(2n + 1) .content .text.active {
    transform: translate(0);
    opacity: 1;
  }

.main .content {
  width: 1000px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.content .picture {
  transform: translate(-50px);
  opacity: 0;
  transition: all 1s ease 0.4s;
}

.content .picture.active {
  transform: translate(0);
  opacity: 1;
}

.content .picture img {
  display: block;
  width: 375px;
}

.content .text {
  transform: translate(50px);
  opacity: 0;
  color: #666;
  transition: all 1s ease 0.4s;
}

.content .text.active {
  transform: translate(0);
  opacity: 1;
}

.content .text .title {
  font-size: 30px;
  margin-bottom: 20px;
}

.content .text .desc {
  font-size: 16px;
}

.footer {
  background-color: #333333;
  height: 100px;
  line-height: 100px;
  color: #333;
  text-align: center;
  color: #999;
  font-size: 12px;
}