* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background: #333;
}
ul {
  list-style: none;
}
.header {
  height: 60px;
  line-height: 60px;
  position: relative;
  background: #990f00;
  text-align: center;
}
.header .home {
  position: absolute;
  left: 10px;
  top: 0;
  color: #fff;
  font-size: 22px;
  text-decoration: none;
}
.header h1 {
  font-size: 22px;
  color: #fff;
}
.center {
  font-size: 20px;
  text-align: center;
  padding: 30px;
}
.center a {
  text-decoration: none;
  font-weight: bold;
  color: green;
}
.footer {
  text-align: center;
}
.footer a {
  text-decoration: none;
  opacity: 0.5;
  padding: 8px;
}
.tips {
  font-size: 18px;
  font-weight: bold;
  color: #333;
}
.b {
  font-weight: bold;
  color: orchid;
}
.main {
  width: 980px;
  margin: 0 auto;
  background: #fff;
}
.main p {
  padding: 20px;
}
img {
  width: 450px;
  border: 4px solid #de9494;
  display: inline-block;
  vertical-align: top;
}
@media screen and (max-width: 800px) {
  body {
    background: #333;
  }
  .main {
    width: 100%;
    color: #333;
  }
  img {
    width: 98vw;
  }
  .center {
    padding: 2px;
  }
}