html, body {
    height: 100%;
}

body {
    background-image: url('stars.gif');
    margin: 0;
}

h1 {
    color: yellow;
    text-shadow: 1px 1px 5px goldenrod;
}

.panel {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-content {
    text-align: center;
}