body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.card {
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.15);
}

.btn-group-sm > .btn {
    margin-right: 0.25rem;
}