seahub/frontend/src/components/common-add-tool/index.css

.add-item-btn {
  display: flex;
  align-items: center;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  border-top: 1px solid #dedede;
  background: #fff;
  padding: 0 1rem;
  border-bottom-left-radius: 3px;
  border-bottom-right-radius: 3px;
  position: relative;
}

.add-item-btn:hover {
  cursor: pointer;
  background: #f5f5f5;
}

.add-item-btn .seafile-multicolor-icon-add-table {
  margin-right: 10px;
  font-size: 12px;
  font-weight: 600;
  transform: none;
  fill: #666;
}

.add-item-btn .description {
  flex: 1;
}