找到站点中的/view/css/bootstrap-bbs.css

然后在合适的位置插入如下代码：

/* H6标题 */

.card-body .message h6 {

border-left: 3px solid #6293d4;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}

/* H5标题 */

.card-body .message h5 {

border-left: 4px solid #84985a;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}

/* H4标题 */

.card-body .message h4 {

border-left: 5px solid #b55594;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}

/* H3标题 */

.card-body .message h3 {

border-left: 6px solid #a232de;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}

/* H2标题 */

.card-body .message h2 {

border-left: 7px solid #32de5d;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}

/* H1标题 */

.card-body .message h1 {

border-left: 8px solid #de3232;

text-indent: 8px;

font-weight: bold;

padding: 2px 0px;

margin: 8px 0px;

}