body, html {    
    height: 100%;
    width: 100%;
    margin: 0px;
    padding: 0px;
    text-align: center;
    font-family: Arial;
}
header {
    margin: auto;
    width: 89.9%;
    background-color: #999;
    height: auto;    
    font-size: 1.5em;
    padding-top: 10px;
    padding-bottom: 10px;
}
#main {
    margin: auto;
    width: 90%;
    height: 100px;    
    display: -webkit-flex; 
    display: flex;
    -webkit-flex-wrap: wrap;
    flex-wrap:wrap;
}

#fondo_foto {background-color:#CCC;}

#main div {
    -webkit-flex-grow: 0; 
    -webkit-flex-shrink: 0; 
    -webkit-flex-basis: 40px; 
    flex-grow: 0;
    flex-shrink: 0;
    flex-basis: 33.3%;
    height: auto;    
    min-width: 200px;
}

li {
    text-align: left;
    margin: 5px;
}
img {
    margin-top: 4px;
}
iframe {
    width: 98%;
    height: 555px;
}