:root {
    --grey-12: #d4d4d4;
    --grey-bg: #f7f7f7;
    --white:#ffffff;
}

body {
    background: var(--grey-bg);
    font-size: 16px;
    font-family: 'Segoe UI',Arial, Helvetica, sans-serif;
}

.container {
    max-width: 800px;
    margin: 10px auto;
    padding: 12px;
    background: var(--white);
    border-radius: 5px;
    border: thin solid var(--grey-12);
}

.sub-header {
    background: transparent;
    border: none;
    padding: 0;
}