body {
    font-family: Verdana, sans-serif;
    padding: 2rem;
    line-height: 1.4;
    font-size: 9pt;
    overflow-wrap: break-word;
}

p {
    margin: 0 0 1em 0;
}

main {
    max-width: 30rem;
    margin: 0 auto;
}

h1 {
    font-weight: bold;
}

h2 {
    font-weight: normal;
    font-style: italic;
}

h1,
h2 {
    font-size: 100%;
    margin-bottom: 0;
}

.subtitle {
    color: #999;
}

input {
    width: 100%;
}

.hidden {
    display: none;
}

.invalid {
    border: 1px solid red;
}

.invalid:focus {
    outline-color: red;
}