body {
    font-family: 'Noto Sans', Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}

.main {
    width: 100%;
    max-width: 640px;
    min-width: 240px;
    margin: 0 auto;
}

.image {
    width: 100%;
}

.heading {
    text-align: center;
    font-size: 20px;
}