.bloco-licao-corpo img {
    display: block;
    width: auto;
    max-width: min(100%, 720px);
    height: auto;
    margin: 20px auto;
    border-radius: 24px;
    box-shadow: 0 12px 24px rgba(73, 41, 104, .14);
    background: rgba(255,255,255,.72);
}

.bloco-licao-corpo a img {
    margin-left: auto;
    margin-right: auto;
}