web/uno.config.ts

import { defineConfig, toEscapedSelector as e, presetUno } from 'unocss'
import transformerVariantGroup from '@unocss/transformer-variant-group'

export default defineConfig({
  // ...UnoCSS options
  rules: [
    [
      /^custom-hover$/,
      ([], { rawSelector }) => {
        const selector = e(rawSelector)
        return `
${selector} {
  display: flex;
  height: 100%;
  padding: 1px 10px 0;
  cursor: pointer;
  align-items: center;
  transition: background var(--transition-time-02);
}
/* you can have multiple rules */
${selector}:hover {
  background-color: var(--top-header-hover-color);
}
.dark ${selector}:hover {
  background-color: var(--el-bg-color-overlay);
}
`
      }
    ],
    [
      /^layout-border__left$/,
      ([], { rawSelector }) => {
        const selector = e(rawSelector)
        return `
${selector}:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background-color: var(--el-border-color);
  z-index: 3;
}
`
      }
    ],
    [
      /^layout-border__right$/,
      ([], { rawSelector }) => {
        const selector = e(rawSelector)
        return `
${selector}:after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 100%;
  background-color: var(--el-border-color);
  z-index: 3;
}
`
      }
    ],
    [
      /^layout-border__top$/,
      ([], { rawSelector }) => {
        const selector = e(rawSelector)
        return `
${selector}:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--el-border-color);
  z-index: 3;
}
`
      }
    ],
    [
      /^layout-border__bottom$/,
      ([], { rawSelector }) => {
        const selector = e(rawSelector)
        return `
${selector}:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--el-border-color);
  z-index: 3;
}
`
      }
    ]
  ],
  presets: [presetUno({ dark: 'class', attributify: false })],
  transformers: [transformerVariantGroup()]
})