@fesjs/fes-design/es/select-tree/style/index.css

fes-design for PC

.fes-select-tree {
  position: relative;
  display: inline-block;
  width: 100%;
  vertical-align: middle;
  color: var(--f-text-color);
  font-size: var(--f-font-size-base);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  font-variant: tabular-nums;
  line-height: 22px;
  font-feature-settings: 'tnum';
}
.fes-select-tree-popper {
  color: var(--f-text-color);
  font-size: var(--f-font-size-base);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  font-variant: tabular-nums;
  line-height: 22px;
  font-feature-settings: 'tnum';
  background: var(--f-white);
}
.fes-select-tree-dropdown {
  box-sizing: border-box;
  min-width: 68px;
  max-width: 640px;
  max-height: 274px;
  padding: var(--f-padding-xsmall);
}
.fes-select-tree-dropdown.is-max-height {
  height: 274px;
}
.fes-select-tree-null {
  text-align: center;
}