.red-bordered-heading{border:2px solid red}.red-underline{text-decoration:underline;text-decoration-color:red}.post-card{margin-bottom:15px;border:1px solid #ccc;padding:10px;cursor:pointer;transition:background-color .2s ease;background-color:#fff}.post-card:hover{background-color:#f5f5f5b3}body{margin:0;font-family:Arial,sans-serif}