body,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
p,
form {
    margin: 0;
    padding: 0;
}

ol,
ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

body {
    color: #333;
    font-weight: 400;
}

img {
    border: 0;
    display: block;
    margin: auto;
}

input[type="text"],
input[type="password"],
textarea,
button {
    vertical-align: middle;
    -webkit-appearance: none;
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    border: none;
    outline: none;
    margin: 0;
    padding: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

a:link,
a:visited,
a:hover,
a:active {
    text-decoration: none;
    outline: none;
}

table {
    border: 0;
    margin: 0;
    padding: 0;
    border-collapse: collapse;
    border-spacing: 0;
}

table td {
    padding: 0;
}

textarea {
    resize: none;
}

body {
    
    font-family: PingFangSC-Regular;
    width: 750px;
    height: 100%;
    margin: auto;
    text-align: center;
    color: #FFFFFF;
    background: #000000;
}

.audio {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}
.audio video {
    position: absolute;
    top:50%;
    left: 50%;
    
    transform: translate(-50%,-50%);
}
@media screen and (max-width: 800px) {
    .audio video  {
        height: 100%;
    }

 }
@media screen and (min-width: 800px) {
    .audio video  {
        width: 100%;
    }
 }