div.img_div{
    height: 0;
    padding-bottom: 50%;
    position: relative;
    overflow: hidden;
    max-width: 100%;
    height: auto;
}

div.img{
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    /* min-height: 15vh; */
    border-radius: 10px 30px 10px 30px;
    background-size: cover;
}

div.img.stephen{
    background-image: url('training/stephen.png');
}
div.img.school{
    background-image: url('training/school.png');
}
div.img.seminar{
    background-image: url('training/seminar.png');
}
div.img.vision{
    background-image: url('training/vision.png');
}
div.img.intercessor{
    background-image: url('training/intercessor.png');
}
div.img.evangelize{
    background-image: url('training/evangelize_road.jpg');
}