.center {
    text-align:center;
    margin: 0 auto;
}

.eighty {
    width:80%;
}

.video {
    position:relative;
    width: 90%;
    height: 0px;
    padding-bottom: 60%;
    margin: 10px auto ; /*margin: top+bottom right+left*/
    
}

.videoframe {
    position: absolute;
    left: 0px;
    top: 0px;
    width:100%;
    height: 100%;
}


.centered {
    background-color: black;
    margin: 0;
    color: white;
    text-align: center;
    padding-top: 20px;
    padding-bottom: 20px;
}

/*
.class
#id
body (html element) */