body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
}

header {
  background: #333;
  color: #fff;
  padding-top: 30px;
  min-height: 70px;
  border-bottom: #54a7ff 3px solid;
}

header a {
  color: #fff;
  text-decoration: none;
  text-transform: uppercase;
  font-size: 16px;
}

header ul {
  padding: 0;
  list-style: none;
}

header li {
  display: inline;
  padding: 0 20px 0 20px;
}

header #branding {
  float: left;
}

header #branding h1 {
  margin: 0;
}

header nav {
  float: right;
  margin-top: 10px;
}

header .highlight,
header .current a {
  color: #54a7ff;
  font-weight: bold;
}

header a:hover {
  color: #ffffff;
  font-weight: bold;
}

.game {
  margin-bottom: 20px;
  padding: 10px;
  background: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.game h2 {
  margin-top: 0;
}

.game-media {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.game-media img,
.game-media video {
  width: 48%;
  max-height: 300px;
  object-fit: cover;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}

footer a {
  color: #54a7ff;
  text-decoration: none;
}

footer a:hover {
  color: #fff;
}
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
}

header {
  background: #333;
  color: #fff;
  padding-top: 30px;
  min-height: 70px;
  border-bottom: #54a7ff 3px solid;
}

header a {
  color: #fff;
  text-decoration: none;
  text-transform: uppercase;
  font-size: 16px;
}

header ul {
  padding: 0;
  list-style: none;
}

header li {
  display: inline;
  padding: 0 20px 0 20px;
}

header #branding {
  float: left;
}

header #branding h1 {
  margin: 0;
}

header nav {
  float: right;
  margin-top: 10px;
}

header .highlight,
header .current a {
  color: #54a7ff;
  font-weight: bold;
}

header a:hover {
  color: #ffffff;
  font-weight: bold;
}

.demo {
  margin-bottom: 20px;
  padding: 10px;
  background: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.demo h2 {
  margin-top: 0;
}

.demo pre {
  background: #f4f4f4;
  padding: 10px;
  border-radius: 5px;
}

.demo .screenshots {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.demo .screenshots img {
  width: 50%;
  max-height: 400px;
  object-fit: cover;
}

.demo video {
  max-height: 400px;
  object-fit: cover;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}

footer a {
  color: #54a7ff;
  text-decoration: none;
}

footer a:hover {
  color: #fff;
}
* {
  margin: 0;
  padding: 0;
  font-family: "Microsoft YaHei";
}
#page {
  margin-right: auto;
  margin-left: auto;
  margin-top: 20px;
  height: 680px;
  width: 980px;
}
#yard {
  height: 600px;
  width: 900px;
  border: 1px solid gray;
  box-shadow: 0 0 10px black;
  float: right;
}
#mark {
  font-weight: 800;
}
#mark_con {
  color: red;
}
#speed {
  font-weight: 800;
}
#speed_con {
  color: red;
}
button {
  width: 50px;
}

.reference-list {
  margin-top: 20px;
  text-align: left;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
  margin-top: auto;
  width: 100%;
}

footer a {
  color: #54a7ff;
  text-decoration: none;
}

footer a:hover {
  color: #fff;
}

.contact-info {
    margin-top: 50px;
}

.contact-item {
    margin-bottom: 20px;
}

.contact-icon {
    margin-right: 20px;
}