想法是将左竖线和底部横线before 元素修改为本站favicon猫爪，由于子比左竖线是全局生效，所以也会影响到相同的地方，例如小工具内的标题以及评论区、相关推荐等区块标题，CSS代码即可解决，里面可替换自己喜欢的图片

代码如下

/*猫爪-www.8l2.cn*/
.title-theme {
    padding: 0px 0px 0px 45px!important;
    background: url(https://8l2-1313360510.cos.ap-chongqing.myqcloud.com//wp-content/uploads/2024/10/20241008170713122.svg) 10px center no-repeat;
    background-size: 30px 20px;
    color: #566889;
}
.title-theme:before {
display:none;
}
.wp-posts-content>h1.wp-block-heading{
    padding: 0px 0px 0px 45px!important;
    background: url(https://8l2-1313360510.cos.ap-chongqing.myqcloud.com//wp-content/uploads/2024/10/20241008170713122.svg) 10px center no-repeat;
    background-size: 30px 20px;
}
.wp-posts-content>h2.wp-block-heading{
    padding: 0px 0px 0px 45px!important;
    background: url(https://8l2-1313360510.cos.ap-chongqing.myqcloud.com//wp-content/uploads/2024/10/20241008170713122.svg) 10px center no-repeat;
    background-size: 30px 20px;
}
.wp-posts-content>h3.wp-block-heading{
    padding: 0px 0px 0px 45px!important;
    background: url(https://8l2-1313360510.cos.ap-chongqing.myqcloud.com//wp-content/uploads/2024/10/20241008170713122.svg) 10px center no-repeat;
    background-size: 30px 20px;
}
.wp-posts-content>h4.wp-block-heading{
    padding: 0px 0px 0px 45px!important;
    background: url(https://8l2-1313360510.cos.ap-chongqing.myqcloud.com//wp-content/uploads/2024/10/20241008170713122.svg) 10px center no-repeat;
    background-size: 30px 20px;
}
.wp-posts-content>h1.wp-block-heading:before{
    display:none;
}
.wp-posts-content>h2.wp-block-heading:before{
    display:none;
}
.wp-posts-content>h3.wp-block-heading:before{
    display:none;
}
.wp-posts-content>h4.wp-block-heading:before{
    display:none;
}
/*猫爪-www.8l2.cn*/

自己将里面的图片本地化一下！！