* {
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  overflow-x: hidden;
}

/* -------- 头部导航 start -------  */
.top-nav {
  height: 100px;
  background-color: #fff;
  display: flex;
  justify-content: space-between;
  padding: 0 120px;
  position: fixed;
  width: 100%;
  box-sizing: border-box;
}

.top-nav .logo {
  height: 100%;
}
header nav a {
  color: rgba(0, 0, 0, 0.5);
  margin: 0 15px;
  text-decoration: none;
  line-height: 100px;
}

header nav a.active {
  color: #000;
  font-weight: bold;
}
header nav a:hover {
  text-decoration: underline;
}
/* -------- 头部导航 end -------  */


.container {
  padding-top: 100px;
  text-align: center;
}
.container img {
  width: 100vw;
  height: auto;
  overflow-x: hidden;
}


footer {
  height: 170px;
  background-color: #fff;
  color: #000;
  text-align: center;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

footer a {
  color: #000;
}