html {
  background: rgb(242, 242, 242);
}
body {
  width: 1920px;
  margin: 0 auto;
  background-color: #fff;
}
a {
  text-decoration: none;
}
/* 头部导航 */
.nav_box {
  width: 100%;
  height: 120px;
}
.nav_box .nav_flex {
  width: 80%;
  height: 100%;
  margin: 0 auto;
  /* display: flex;
  flex-wrap: wrap; */
}
.nav_box .nav_flex > img {
  height: 40%;
  width: auto;
  margin: 30px 0;
  float: left;
}
.nav_box .nav_flex .nav_list {
  width: 70%;
  float: right;
  height: 100%;
  display: flex;
}
.nav_box .nav_flex .nav_list a {
  display: block;
  height: 98%;
  line-height: 100px;
  text-align: center;
  color: #000;
  font-size: 16px;
  margin: 0 38px;
}
.nav_box .nav_flex .nav_list .pitch_item {
  color: rgb(75, 137, 218);
  border-bottom: 3px solid rgb(75, 137, 218);
}

.main {
  width: 100%;
  overflow: hidden;
}
/* 底部导航 */
.foot_box {
  width: 100%;
  height: 450px;
  background-color: rgb(45, 45, 47);
  border-top: 10px solid rgb(75, 137, 218);
}
.foot_box .foot_content {
  width: 80%;
  height: 66%;
  margin: 0 auto;
}
.foot_introduce {
  width: 100%;
  height: 300px;
  margin-top: 70px;
  display: flex;
  flex-wrap: wrap;
  color: #fff;
}
.foot_introduce .foot_introduce_left {
  width: 20%;
  margin: 0 auto;
}
.foot_introduce .foot_introduce_left > img {
  width: 100%;
  margin-bottom: 20px;
}
.foot_introduce .foot_introduce_left p {
  font-style: normal;
  font-weight: 400;
  font-size: 15px;
}
.foot_introduce .foot_introduce_center {
  width: 50%;
  margin: 0 auto;
  display: flex;
}
.foot_introduce .foot_introduce_center .foot_introduce_center_item {
  width: 100%;
}
.foot_introduce
  .foot_introduce_center
  .foot_introduce_center_item
  .foot_introduce_center_title {
  width: 60%;
  border-bottom: 1px solid #fff;
  height: 50px;
  margin-bottom: 30px;
}
.foot_introduce .foot_introduce_center .foot_introduce_center_item p a {
  color: #fff;
}

.foot_introduce .foot_introduce_right {
  width: 20%;
  margin: 0 auto;
}

.foot_introduce .foot_introduce_right .foot_introduce_center_item {
  width: 100%;
}
.foot_introduce .foot_introduce_right .foot_introduce_center_title {
  border-bottom: 1px solid #fff;
  width: 80%;
  height: 50px;
  margin-bottom: 30px;
}
.foot_introduce .foot_introduce_right div a {
  color: #fff;
}
.foot_introduce .foot_introduce_right .foot_introduce_ercode {
}
.foot_introduce .foot_introduce_right .foot_introduce_ercode img {
  width: 35%;
  margin-right: 10px;
}
.foot_friendship {
  height: 80px;
  border-top: 1px solid #fff;
  width: 80%;
  margin: 0 auto;
  display: flex;
  line-height: 80px;
  color: #fff;
}
.foot_friendship .to_tight {
  margin-left: auto;
}