* {
  box-sizing: border-box;
}
ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.container {
  width: 1200px;
  margin: 0 auto;
  padding: 0 30px;
}
.header {
  width: 100%;
  height: 83px;
  position: fixed;
  top: 0;
  border-top: 3px solid #10b0e5;
  background: url("../images/home/head-bg.png");
  z-index: 800;
}
.header-blue {
  display: block;
}
.header-white {
  display: none;
  background: #fff;
}