#main_container{
    text-align: center;
}

#main_container img, #main_container video{
    display: block;
    max-width: 98%;
    margin: auto;
    margin-top: 1vh;
    margin-bottom: 3vh;
    border-radius: 10px;
    border-color: rgb(200, 200, 200);
    border-width: 3px;
    border-style: solid;
}

#main_container .oc{
    color: rgb(180, 180, 180);
    font-style: italic;
}