DTAiLab/static/sass/atlantis/components/_activityfeed.scss

.activity-feed {
  padding: 15px;
  list-style: none;
  .feed-item {
    position: relative;
    padding-bottom: 20px;
    padding-left: 30px;
    border-left: 2px solid #e4e8eb;
    &:last-child {
      border-color: transparent;
    }
    &::after {
      content: "";
      display: block;
      position: absolute;
      top: 0;
      left: -7px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #177dff;
    }
  }
}

@mixin feed-item-state($color) {
  background: $color !important;
}

.feed-item-default::after {
  @include feed-item-state($dark-color);
}

.feed-item-primary::after {
  @include feed-item-state($primary-color);
}

.feed-item-secondary::after {
  @include feed-item-state($secondary-color);
}

.feed-item-success::after {
  @include feed-item-state($success-color);
}

.feed-item-danger::after {
  @include feed-item-state($danger-color);
}

.feed-item-info::after {
  @include feed-item-state($info-color);
}

.feed-item-warning::after {
  @include feed-item-state($warning-color);
}

.activity-feed .feed-item {
  .date {
    display: block;
    position: relative;
    top: -5px;
    color: #8c96a3;
    text-transform: uppercase;
    font-size: 13px;
  }
  .text {
    position: relative;
    top: -3px;
  }
}