.sidebar {
  flex: 1;
  background-color: #fff;
  overflow: hidden;
}

.sidebar .level-one-title {
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 24px;
  font-size: 20px;
  background-color: #F2F2F2;
  border-left: 2px solid #B21E28;
  border-bottom: 1px solid #EEEEEE;
}

.sidebar .level-one-title img {
  height: 32px;
  margin-right: 14px;
}

.sidebar .button-icon {
  display: flex;
  align-items: center;
  height: 100%;
  margin-left: 10px;
  cursor: pointer;
}

.sidebar .button-icon .expand-icon {
  width: 12px;
}

.sidebar .button-icon .close-icon {
  width: 12px;
  display: none;
}

.sidebar .column-name:hover {
  color: #B21E28;
}

.sidebar > ul > li > .column-item {
  color: #333333;
  background-color: #F2F2F2;
  border: 1px solid #EEEEEE;
}

.sidebar > ul > li > .column-item-active {
  background-color: #ffffff;
  border: none;
}

.sidebar > ul .column-item {
  height: 54px;
  padding: 0 24px;
  color: #666666;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar > ul .column-item .column-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar > ul .column-item-active .button-icon .expand-icon {
  width: 12px;
  display: none;
}

.sidebar > ul .column-item-active .button-icon .close-icon {
  width: 12px;
  display: block;
}

.sidebar > ul .chidern-column-ul {
  padding-left: 16px;
  display: none;
}

.sidebar > ul .chidern-column-ul .column-item {
  padding: 0 24px;
}