Custom css

<template>
    <div style='height: 100vh'>
        <vue-reader url='/vue-book-reader/files/啼笑因缘.epub' :getRendition="getRendition" />
    </div>
</template>

<script setup>
import { VueReader } from 'vue-book-reader'

const getRendition = (rendition) => {
    rendition.renderer.setStyles([
        `html {
      background: #000;
      color: #fff;
    }`,
    ])
}
</script>
<style scoped>
:deep(.readerArea) {
    background: #000 !important;
}

:deep(.readerArea .titleArea) {
    color: #ccc !important;
}

:deep(.readerArea .arrow) {
    color: white !important;
}

:deep(.tocArea) {
    color: #ccc !important;
    background: #111 !important;
}

:deep(.tocButtonExpanded) {
    background: #222 !important;
}

:deep(.tocButtonBar) {
    background: #fff !important;
}

:deep(.tocButton) {
    color: white !important;
}
</style>