body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-image: url('images/anne-lambeck-5VC4thmwMms-unsplash.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}
.main-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: auto;
    min-height: 100vh;
}