* {
    margin: 0;
    padding: 0;
}

/* all font-size based 16px = 1em */
p, span, ul {
    font-size: 16;
    font-family:Verdana, Geneva, Tahoma, sans-serif;
}

h1, h2, h3, h4, h5 {
    font-family: 'Courier New', Courier, monospace;
}

h1 {font-size: 80px;  /* 5em */}

h2 {font-size:  64px;  /* 4em */}

h3 {font-size: 48px;  /* 3em */}

h4 { font-size: 32px;  /* 2em */}

h5 {font-size: 24px; /* 1.5em */}

body {
    height: 100vh;
}