* {
  margin: 0;
  padding: 0;
}
a {
  text-decoration: none;
  color: skyblue;
}
li {
  list-style: none;
}
body {
  font-family: Avenir, Helvetica, Arial, sans-serif;
}
@media screen and (min-width: 500px) {
  body {
    background: url(img/pc_bj.png) no-repeat;
    background-size: 100%;
  }
  .header {
    display: flex;
  }
  .header .logo {
    flex: 1;
    margin: 30px 0 0 120px;
  }
  .header .nav {
    flex: 1;
    text-align: right;
    margin: 60px 70px 0 0;
  }
  .header .nav ul li {
    display: inline-block;
    text-align: center;
    padding: 0 10px;
  }
  .header .nav ul li a {
    font-size: 18px;
    color: #6f8eff;
    font-weight: 500;
  }
  .header .nav ul li a:hover {
    color: red;
  }
  .main {
    margin: 120px 0 0 120px;
    width: 420px;
  }
  .main h1 {
    font-family: Alibaba-PuHuiTi-Heavy;
    font-family: fantasy;
    font-size: 60px;
    font-weight: bold;
  }
  .main p {
    font-size: 18px;
    color: #9292a6;
  }
  .main .btn {
    margin-top: 50px;
  }
  .main .btn a {
    display: inline-block;
    width: 167px;
    line-height: 60px;
    text-align: center;
    border-radius: 10px;
  }
  .main .btn a:nth-child(1) {
    color: #fff;
    background: linear-gradient(96.15deg, #446DFF 2.85%, rgba(99, 125, 255, 0.75) 100%), #FFFFFF;
  }
  .main .btn a:nth-child(2) {
    margin-left: 20px;
    color: #446dff;
    border: #859aff 2px solid;
  }
  .ico dl {
    padding: 2px;
    width: 120px;
    position: absolute;
    left: 520px;
    top: 430px;
    border: #446DFF 2px solid;
  }
  .ico dl dt img {
    width: 100%;
  }
  .ico dl dd {
    text-align: center;
    font-size: 13px;
  }
}