body{
    background-color: #9fca99;
    width: 1200px;
    margin-top: 10px;
    margin-left: 20px;
    margin-right: 20px;
}

#top {
    text-align: right;
    font-size: 20px;
}
#back_button {
    float: left;
}

#video2 {
    text-align: center;
    font-size: 70px;
}

#next_button {
    position: absolute;
    right: 70px;
    bottom: 10px;
}