body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
.content {
    flex: 1 0 auto;
}
.footer {
    flex-shrink: 0;
    background-color: #f8f9fa;
    padding: 20px 0;
    margin-top: 20px;
}
html, body {
    height: 100%;
}
body {
    display: flex;
    flex-direction: column;
}
.content {
    flex: 1 0 auto;
}
.footer {
    flex-shrink: 0;
    background-color: #f8f9fa;
}