リストブロック｜分割（数字背景塗り）

bf-list-split--num-bg

ol.bf-list-split--num-bg {
    line-height: 1.5;
    margin-top: 0;
    margin-bottom: 2em;
    padding: 0;
    counter-reset: num-bg;
    list-style-type: none;
}
.bf-list-split--num-bg li {
    display: flex;
    position: relative;
    padding: 0.75rem 1rem 1rem 3.5rem;
}
.has-background .bf-list-split--num-bg li:not(:last-child) {
    border-bottom: 0.75rem solid #fff;
}
.bf-list-split--num-bg li:before {
    position: absolute;
    top: 0;
    left: 0;
    width: 3rem;
    height: 100%;
    background-color: currentColor;
    content: "";
}
.bf-list-split--num-bg li:after {
    display: flex;
    position: absolute;
    left: 0;
    width: 3rem;
    height: 24px;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-weight: bold;
    content: counter(num-bg)"";
    counter-increment: num-bg;
}
.has-background .bf-list-split--num-bg {
    padding: 0;
}