body {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
    background-color: #f4f6f9;
}
main {
    flex: 1 0 auto;
}
.mt-5 {
    margin-top: 50px;
}
.mb-4 {
    margin-bottom: 40px;
}
.card {
    border-radius: 8px;
}