添加如下 css，可给评论框添加背景图：
/*评论背景图*/
textarea#comment {
background-color:transparent;background:linear-gradient(rgba(0, 0, 0, 0.05), rgba(0, 0, 0, 0.05)),url(/wp-content/uploads/2023/03/comment.png) right 10px bottom 10px no-repeat;-moz-transition:ease-in-out 0.45s;-webkit-transition:ease-in-out 0.45s;-o-transition:ease-in-out 0.45s;-ms-transition:ease-in-out 0.45s;transition:ease-in-out 0.45s;
}
textarea#comment:focus {
background-position-y:789px;-moz-transition:ease-in-out 0.45s;-webkit-transition:ease-in-out 0.45s;-o-transition:ease-in-out 0.45s;-ms-transition:ease-in-out 0.45s;transition:ease-in-out 0.45s;
}
背景图链接需要替换为自己的，效果如下：
