/* banner */
.banner {
  /* max-width: 1920px; */
  width: 100%;
  margin: 0 auto;
}
.banner img {
  width: 100%;
}
/* btn_box */
.btn_box {
  position: fixed;
  right: 0;
  top: 327px;
  z-index: 9999;
}
.btn_box .btn {
  width: 115px;
  height: 49px;
  border: 0;
  display: block;
}
.live_msg {
  background-image: url('../images/projects_case/live_msg.png');
  margin-top: 2px;
}
/* 联系我们 */
.contact_us .content {
  width: 1280px;
  margin: 0 auto;
}
.contact_us .content .title {
  padding-top: 62px;
  padding-bottom: 12px;
  font-size: 36px;
  color: #4A90E2;
  letter-spacing: 5px;
  border-bottom: 2px solid #4A90E2;
  text-align: center;
  font-weight: 400;
}
.contact_us .content .info {
  display: flex;
  justify-content: center;
  padding-top: 94px;
  padding-bottom: 162px;
} 
.contact_us .content .info .desc {
  font-family: PingFangSC-Regular;
  font-size: 24px;
  color: #333333;
  line-height: 40px;
  margin-right: 54px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.contact_us .content .info .desc_title {
  font-size: 30px;
  color: #4A90E2;
  letter-spacing: 1px;
  line-height: 44px;
  padding-bottom: 33px;
  font-weight: 400;
}