body {
    font-size: 18px;
    font-family: 'PT Serif', Serif;
}

.content {
    width: 840px;
    margin: 0 auto;
}

.greeting,
.hello {
    margin-top: 1.8em;
    font-size: 3.4em;
    margin-bottom: 0.6em;
    font-weight: normal;
}

.heading {
    margin-top: 2.3em;
    margin-bottom: 0.4em;
    font-size: 1.2em;
    font-weight: normal;
}

.hello {
    display: none;
}

.text {
    margin-bottom: 0.8em;
}


@media (max-width: 839px) {

    body {
        font-size: 16px;
    }

    .content {
        margin: 20px 0;
        width: auto;
    }

    .greeting,
    .hello {
        margin-top: 0.8em;
    }

    .greeting {
        display: none;
    }

    .hello {
        display: block;
    }

}

@media (max-width: 480px) {

    .content {
        margin: 10px 0;
        width: auto;
    }

}