html,
body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

html {
    font-size: 62.5%;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

h1 {
    padding: 0;
    margin: 0;
    font-size: 3.2rem;
}

h2 {
    padding: 0;
    margin: 0;
    font-size: 1.8em;
}

p {
    padding: 0;
    margin: 0;
    font-size: 1.6rem;
}

.message-container {
    max-width: 52rem;
    padding: 0;
}

.message-container h2 {
    padding: 1.6rem 2rem 1rem 2rem;
}

.message-header {
    background: #00498c;
    color: white;
    padding: 1rem 2rem;
    border-radius: 4px;
}

.message-body {
    padding: 1rem 2rem;
    text-align: center;
}

mark {
    background: #eeeeee;
}