.hide-subject #postform dl:has(#subject),
.hide-subject .quickreply dl:has(#subject) { 
    display: none; 
}

[id^="post_content"] > h3 { display: none }

p.author {
    border: 1px solid #dcdcdc;
    background-color: #eaf2fa;
    padding: 10px 12px;
    display: block;
    margin-bottom: 10px;
}