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

body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    color: #333;
    background-color: #eee;
}

#main, #header {
    width: 100%;
}

#main {
    max-width: 900px;
    padding-top: 5em;
    margin-left: auto;
    margin-right: auto;
}

.section {
    border: 1px solid #ddd;
    background-color: #fff;
    width: 100%;
    margin-bottom: 1em;
    padding: 0.5em 1em;
}

#header > .section {
    position: fixed;
    border: 0;
    border-bottom: 1px solid #ddd;
}

h1 {
    left: 0;
    width: 100%;
    max-width: 900px;
    font-size: 2.5rem;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
    white-space: nowrap;
    height: 3rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

ul {
    padding: 0.5rem 2rem;
}

p {
    margin: 1rem 0;
}

.print-only {
    display: none;
}

@media only screen and (max-width: 850px) {

    .mobile-hide {
        display: none;
    }

}

@media only screen and (max-width: 500px) {

    h1 {
        font-size: 2rem;
    }
    
}

@media print {
    
    body {
        background-color: initial;
    }

    #main {
        padding-top: 1em;
    }

    #header > .section {
        position: relative;
    }

    .section {
        border: none;
    }

    .print-only {
        display: block;
    }

}