.container {
  max-width: 1920px;
  margin: 0 auto;
  font-size: 14px; }

header {
  position: fixed;
  width: 100%;
  height: 100px;
  line-height: 100px;
  background-color: rgba(30, 33, 35, 0.8);
  z-index: 1; }
  header .logo {
    float: left;
    margin-left: 200px; }
  header nav, header .btn {
    float: right; }
  header .btn {
    width: 191px;
    height: 55px;
    background: url("../images/btn-link1.png") 0 0 no-repeat;
    margin-left: 70px;
    margin-right: 200px;
    margin-top: 20px; }
    header .btn:hover {
      background-position: 0 -90px; }
  header nav {
    font-size: 16px; }
    header nav a {
      color: #fff;
      margin-left: 30px; }

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