.delta-lesson-list { list-style: decimal inside; padding-left: 0; }
.delta-lesson-item {
    padding: 12px;
    border-bottom: 1px solid var(--delta-border-color);
    display: flex; justify-content: space-between; align-items: center;
}
.delta-lesson-item.is-completed { background: var(--delta-success-light); }