#calendar section {

    float: left;
    width: 353px;
    margin-right: 30px;
    margin-bottom: 0;
}

@media screen and (max-width: 1200px) {
    #calendar section {
        width: 558px;
    }
}

#calendar section.facebook.big,
#calendar section.facebook.small  {
    margin-right: 0;
}

@media screen and (max-width: 1200px) {
  #calendar section.facebook.small, #calendar section.twitter.small
    {
        width:250px;
    }
}