.wp-block-my-html textarea {
    min-height: 180px;
    font-family:
        Consolas,
        Monaco,
        "Courier New",
        monospace;
    line-height: 1.6;
}

.my-html-block-title {
    font-weight: bold;
    margin-bottom: 12px;
    font-size: .8em;
}