[css] 第三版（凑热闹）标题颜色变化 + 标题下加渐变横线

/*1-6级标题颜色*/
[data-type="NodeHeading"][class="h1"] {
  /*display: inline-block !important; 右上角引用的数字显示不正常，注释掉这一行正常,下面一样，直接删除掉了*/
  color: #d40045 !important;
}
[data-type="NodeHeading"][class="h2"] {

  color: #ff7f00 !important;
}
[data-type="NodeHeading"][class="h3"] {

  color: #66b82b !important;
}
[data-type="NodeHeading"][class="h4"] {

  color: #e8c258 !important;
}
[data-type="NodeHeading"][class="h5"] {

  color: #996fea !important;
}
[data-type="NodeHeading"][class="h6"] {

  color: #5d94e1 !important;
}
/* 1-6级标题下画渐变色横线，取自主题-卡片边框化 */
div[data-subtype="h1"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}
div[data-subtype="h2"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}
div[data-subtype="h3"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}
div[data-subtype="h4"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}
div[data-subtype="h5"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}
div[data-subtype="h6"]:after {
    content: "";
    font-size: 8px;
    left: 0;
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, rgb(255, 255, 255), rgb(0, 0, 0));
}