body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    font-size: 100%; /* usually 16px default */
}

.container {
    max-width: 37.5rem; /* 600px */
    margin: 0 auto;
    padding: 1.25rem; /* 20px */
}

.text-block {
    background-color: #fff;
    padding: 0.9375rem; /* 15px */
    margin-bottom: 0.625rem; /* 10px */
    border-radius: 0.3125rem; /* 5px */
    box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,0.1);
    font-size: 2rem; /* Half of previous 4rem (approx 32px) */
    line-height: 1.4;
    word-wrap: break-word;
}