html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
}

.header, .footer {
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.main-content {
    flex: 1;
    display: grid;
    grid-auto-flow: column;
}