* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a {
  text-decoration: none;
}
img {
  border: none;
}
li {
  list-style: none;
}
.clear {
  clear: both;
}
#videoshow {
  display: none;
  position: fixed;
  left: 50%;
  top: 50%;
  margin-left: -320px;
  margin-top: -200px;
  width: 640px;
  height: 400px;
  z-index: 9999;
}
#videoshow video {
  display: block;
  width: 100%;
  height: 100%;
}
#videobj {
  display: none;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index:9998;
}
@media screen and (max-width: 640px) {
  #videoshow {
    width: 100%;
    height: 80vw;
    position: absolute;
    left: 0;
    top: 50%;
    margin-left: 0px;
    margin-top: -40vw;
  }
}