* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

header {
    text-align: center;
    box-shadow: 0 2px 3px #00000029;
    padding: 1em 0;
}

header h1 {
    font-size: x-large;
}