@media only screen and (max-width: 800px) {
  body {
    width: 100%;
  }

  .img {
    max-width: 50%;
    max-height: 50%;
    margin: auto;
  }

  .video {
    max-width: 100%;
    max-height: 100%;
  }
}


body {
  max-width: 800px;
  min-width: 280px;
  background-color: rgba(13, 13, 25);
  background-image: url(pic/background.jpg);
  margin: auto;
  padding: 0;
  color: #fcfcfc;
  font-family: Arial;
  font-size: 21px;
  word-wrap: break-word;
}

.main {
  background-color: rgba(35, 35, 35, 0.7);
  margin: auto;
  display: flex;
  flex-direction: column;
  line-height:21px;
}

.main a {
  color: #4f92ff;
}

.main a:hover {
  color: #1f75ff;
}

.head {
  padding-top: 25px;
  padding-bottom: 25px;
  width: 100%;
  table-layout: fixed;
  background-color: rgba(0, 0, 0, 0.5);
}

.head a {
  color: #4f92ff;
}

.head a:hover {
  color: #1f75ff;
}

.content {
  margin: 30px;
  margin-top: 0px;
  min-height: 300px;
  line-height: 30px;
}

.poster {
  max-width: 100%;
  max-height: 100%;
  margin: auto;
}

.column {
  float: center;
  width: 100%;
  padding-top: 20px;
  padding-bottom: 20px;
  line-height: 28px;
  text-align: center;
}

.button a {
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.3);
  color: #f2f2f2;
  margin-bottom: 5px;
  margin-left: 3px;
  margin-right: 3px;
  padding: 12px;
  padding-left: 22px;
  padding-right: 22px;
  text-decoration: none;
}

.button a:hover {
  background-color: #ddd;
  color: black;
}

.footer {
  background-color: rgba(0, 0, 0, 0.5);
  color: rgba(170, 170, 170);
  text-align: center;
  font-size:18px;
  line-height: 28px;
  padding-top: 30px;
  padding-bottom: 45px;
}

.footer a {
  color: #4f92ff;
}

.footer a:hover {
  color: #1f75ff;
}