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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-image: url("background.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
}

a {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    color: rgb(155, 155, 155);
    text-decoration: none;
    opacity: 0.7;
}

a:hover {
    opacity: 1;
    text-decoration: underline;
}