社区 API 中用户详情这两个字段是啥？

社区客户端 API 文档中根据用户名获取用户详情：

• GET 方法：https://hacpai.com/api/v2/user/{userName}
• 示例：https://hacpai.com/api/v2/user/88250

API 返回：

{
    "msg": "",
    "random": "nxCCidfUdUYwyHjUfFdIccUYwAImVLNYiSPItFuqkcPmAPjU",
    "code": 0,
    "data": {"user": {
        "userAvatarURL96": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg?imageView2/1/w/96/h/96/interlace/0/q/100",
        "userNickname": "D",
        "userAppRole": 1,
        "userCardBImgURL": "https://img.hacpai.com/bg/card/1353745196354_1584269332157.jpg",
        "userCurrentCheckinStreak": 866,
        "userAvatarURL": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg",
        "userAvatarURL256": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg?imageView2/1/w/256/h/256/interlace/0/q/100",
        "userIntro": "全职做开源，自由职业者。",
        "userAvatarURL128": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg?imageView2/1/w/128/h/128/interlace/0/q/100",
        "userPointCC": "458533",
        "userHomeBImgDColor": "#9BB8CA",
        "userTags": "Java,golang,Linux,开源",
        "userURL": "https://88250.b3log.org",
        "userTagCount": 515,
        "userComment2Count": 331,
        "userLongestCheckinStreak": 866,
        "userAvatarURL48": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg?imageView2/1/w/48/h/48/interlace/0/q/100",
        "userNo": 1,
        "userCardBImgDColor": "#E4D6BB",
        "userPoint": 284755,
        "userCommentCount": 14832,
        "userGeneralRank": 348287,
        "oId": "1353745196354",
        "userName": "88250",
        "userHomeBImgURL": "https://img.hacpai.com/bg/home/1353745196354_1584269272734.jpg",
        "userArticleCount": 674,
        "userAvatarURL64": "https://img.hacpai.com/avatar/1353745196354_1584267806213.jpeg?imageView2/1/w/64/h/64/interlace/0/q/100",
        "userRole": "adminRole"
    }}
}

请问 @88250 这两字段是干啥用的：

• userHomeBImgDColor
• userCardBImgDColor

从值上看应该是 CSS 色值吧？