div span.text-center.date {
    display: none;
}
.div_lecturer{
    display: block;
}
.br{
    display: none;
}
.img_lecturer{
    float: left;
    margin: 0 20px 20px 0;
}
@media screen and (max-width: 480px){
.br{
    display: block;
}
.div_lecturer{
    text-align: center;
}
.img_lecturer{
    float: none;
    margin: auto;
    width: 150px;
}
{
    display: block;
    text-align: center;
}
}