middle content class

gistfile1.txt

.middle-content {
    text-align: center;
    height: 100%;
    display: -webkit-box;
    -webkit-box-pack: center;
    -webkit-box-align: center;
    display: -moz-box;
    -moz-box-pack: center;
    -moz-box-align: center;
    display: -ms-flexbox;
    -ms-flex-pack: center;
    -ms-flex-align: center;
    width: auto;
}