/*  good solution for same height cols using flex-box by Nicholas Cerminara:
*   https://scotch.io/bar-talk/different-tricks-on-how-to-make-bootstrap-columns-all-the-same-height
*/
.row.is-flex {
    display: flex;
    flex-wrap: wrap;
}
.row.is-flex > [class*='col-'] {
    display: flex;
    flex-direction: column;
}
/*
* And with max cross-browser enabled.
* Nobody should ever write this by hand. 
* Use a preprocesser with autoprefixing.
*/
.row.is-flex {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
}

.row.is-flex > [class*='col-'] {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}
.fill_height{
    height: 100%;
}