.card img {
    max-height: 11rem;
    transition: all 2s ease;
}
.inner {
    overflow: hidden;
}
.inner:hover img {
    transform: scale(1.5);
}
.card {
    margin-top: 8%;
    margin-left: 4%;
}
.card:hover {
    background-color: #f4f3f6;
}
#btn1-back {
    text-align: right;
}
.btn-hidden {
    visibility: hidden;
}