.demo_container{
    border: 2px solid #ddd;
    border-radius: 25px 25px 25px 25px;
}

.main_row_div{
    height:70vh;
}

.card-footer{
    position:absolute;
}

@media (max-width:760px){
    .main_row_div{
        height:auto;
    }
    .card-footer{
        position:initial;
    }
}