.wp-block-ttfb-blocks-chapter {

    .container-chapter{
        max-width: 900px;
    }

    h1,h2,h3,h4,h5,h6{
        letter-spacing: 1.5px;
        border-bottom: 1px solid transparent;
        font-size: 2.3rem;
        margin: 0;
        line-height: 1;
    }

    .sup-title{ font-size: 55%; }

    .main-content a{
        color: inherit;
        text-decoration: underline;
    }

    @media (max-width: 40em) {
        .main-content{ text-align: center; }
    }
}