.content_box {
    width: 1200px;
    margin: 0 auto;
    min-height:calc(100vh - 207px);
    color: #4a4a4a;
}
.next_button {
    text-align: center;
    margin: 50px 0;
}
.nav_title {
    padding: 10px 0 10px 10px;
    margin:25px 0;
    background-color: #eeeeee;
}
.nav_title h2 {
    padding-left: 5px;
    border-left: 3px solid #1E9FFF;
    height: 14px;
    line-height: 14px;
    font-weight: 600;
}
.video_authentication {
    text-align: center;
    height: 300px;
}