アヒルのデモ > https://google-custom.blogspot.com/
強制ダークモード
<html data-bs-theme='dark'
または
画面右下に切り替えのトグルを出す方法
1.追加CSS
<style>.bi{vertical-align:-.125em;fill:currentColor}.btn-bd-primary{--bd-violet-bg: #712cf9;--bd-violet-rgb: 112.520718, 44.062154, 249.437846;--bs-btn-font-weight: 600;--bs-btn-color: var(--bs-white);--bs-btn-bg: var(--bd-violet-bg);--bs-btn-border-color: var(--bd-violet-bg);--bs-btn-hover-color: var(--bs-white);--bs-btn-hover-bg: #6528e0;--bs-btn-hover-border-color: #6528e0;--bs-btn-focus-shadow-rgb: var(--bd-violet-rgb);--bs-btn-active-color: var(--bs-btn-hover-color);--bs-btn-active-bg: #5a23c8;--bs-btn-active-border-color: #5a23c8}.bd-mode-toggle{z-index:1500}.bd-mode-toggle .bi{width:1em;height:1em}.bd-mode-toggle .dropdown-menu .active .bi{display:block!important}
</style>
bootstrap-5.3.7-examples より
*要らないところは削ってあると思いますが、以前とCSSが変わっているので、完全なチェックは行っていません
2.<body>下に追加
<svg class='d-none' xmlns='http://www.w3.org/2000/svg'> <symbol id='check2' viewBox='0 0 16 16'> <path d='M13.854 3.646a.5.5 0 0 1 0 .708l-7 7a.5.5 0 0 1-.708 0l-3.5-3.5a.5.5 0 1 1 .708-.708L6.5 10.293l6.646-6.647a.5.5 0 0 1 .708 0z'/> </symbol> <symbol id='circle-half' viewBox='0 0 16 16'> <path d='M8 15A7 7 0 1 0 8 1v14zm0 1A8 8 0 1 1 8 0a8 8 0 0 1 0 16z'/> </symbol> <symbol id='moon-stars-fill' viewBox='0 0 16 16'> <path d='M6 .278a.768.768 0 0 1 .08.858 7.208 7.208 0 0 0-.878 3.46c0 4.021 3.278 7.277 7.318 7.277.527 0 1.04-.055 1.533-.16a.787.787 0 0 1 .81.316.733.733 0 0 1-.031.893A8.349 8.349 0 0 1 8.344 16C3.734 16 0 12.286 0 7.71 0 4.266 2.114 1.312 5.124.06A.752.752 0 0 1 6 .278z'/> <path d='M10.794 3.148a.217.217 0 0 1 .412 0l.387 1.162c.173.518.579.924 1.097 1.097l1.162.387a.217.217 0 0 1 0 .412l-1.162.387a1.734 1.734 0 0 0-1.097 1.097l-.387 1.162a.217.217 0 0 1-.412 0l-.387-1.162A1.734 1.734 0 0 0 9.31 6.593l-1.162-.387a.217.217 0 0 1 0-.412l1.162-.387a1.734 1.734 0 0 0 1.097-1.097l.387-1.162zM13.863.099a.145.145 0 0 1 .274 0l.258.774c.115.346.386.617.732.732l.774.258a.145.145 0 0 1 0 .274l-.774.258a1.156 1.156 0 0 0-.732.732l-.258.774a.145.145 0 0 1-.274 0l-.258-.774a1.156 1.156 0 0 0-.732-.732l-.774-.258a.145.145 0 0 1 0-.274l.774-.258c.346-.115.617-.386.732-.732L13.863.1z'/> </symbol> <symbol id='sun-fill' viewBox='0 0 16 16'> <path d='M8 12a4 4 0 1 0 0-8 4 4 0 0 0 0 8zM8 0a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 0zm0 13a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 13zm8-5a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2a.5.5 0 0 1 .5.5zM3 8a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2A.5.5 0 0 1 3 8zm10.657-5.657a.5.5 0 0 1 0 .707l-1.414 1.415a.5.5 0 1 1-.707-.708l1.414-1.414a.5.5 0 0 1 .707 0zm-9.193 9.193a.5.5 0 0 1 0 .707L3.05 13.657a.5.5 0 0 1-.707-.707l1.414-1.414a.5.5 0 0 1 .707 0zm9.193 2.121a.5.5 0 0 1-.707 0l-1.414-1.414a.5.5 0 0 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .707zM4.464 4.465a.5.5 0 0 1-.707 0L2.343 3.05a.5.5 0 1 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .708z'/> </symbol> </svg> <div class='dropdown position-fixed bottom-0 end-0 mb-3 me-3 bd-mode-toggle'> <button aria-expanded='false' aria-label='Toggle theme (auto)' class='btn btn-bd-primary py-2 dropdown-toggle d-flex align-items-center' data-bs-toggle='dropdown' id='bd-theme' type='button'> <svg aria-hidden='true' class='bi my-1 theme-icon-active'><use href='#circle-half'/></svg> <span class='visually-hidden' id='bd-theme-text'>Toggle theme</span> </button> <ul aria-labelledby='bd-theme-text' class='dropdown-menu dropdown-menu-end shadow'> <li> <button aria-pressed='false' class='dropdown-item d-flex align-items-center' data-bs-theme-value='light' type='button'> <svg aria-hidden='true' class='bi me-2 opacity-50'><use href='#sun-fill'/></svg>
3.</body>上(<!-- Bootstrap JS -->上)に追加
<script>
// <![CDATA[
/*!
* Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
* Copyright 2011-2025 The Bootstrap Authors
* Licensed under the Creative Commons Attribution 3.0 Unported License.
*/
(() => {
'use strict'
const getStoredTheme = () => localStorage.getItem('theme')
const setStoredTheme = theme => localStorage.setItem('theme', theme)
const getPreferredTheme = () => {
const storedTheme = getStoredTheme()
if (storedTheme) {
return storedTheme
}
return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
}
const setTheme = theme => {
if (theme === 'auto') {
document.documentElement.setAttribute('data-bs-theme', (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'))
} else {
document.documentElement.setAttribute('data-bs-theme', theme)
}
}
setTheme(getPreferredTheme())
const showActiveTheme = (theme, focus = false) => {
const themeSwitcher = document.querySelector('#bd-theme')
if (!themeSwitcher) {
return
}
const themeSwitcherText = document.querySelector('#bd-theme-text')
const activeThemeIcon = document.querySelector('.theme-icon-active use')
const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`)
const svgOfActiveBtn = btnToActive.querySelector('svg use').getAttribute('href')
document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
element.classList.remove('active')
element.setAttribute('aria-pressed', 'false')
})
btnToActive.classList.add('active')
btnToActive.setAttribute('aria-pressed', 'true')
activeThemeIcon.setAttribute('href', svgOfActiveBtn)
const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
themeSwitcher.setAttribute('aria-label', themeSwitcherLabel)
if (focus) {
themeSwitcher.focus()
}
}
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
const storedTheme = getStoredTheme()
if (storedTheme !== 'light' && storedTheme !== 'dark') {
setTheme(getPreferredTheme())
}
})
window.addEventListener('DOMContentLoaded', () => {
showActiveTheme(getPreferredTheme())
document.querySelectorAll('[data-bs-theme-value]')
.forEach(toggle => {
toggle.addEventListener('click', () => {
const theme = toggle.getAttribute('data-bs-theme-value')
setStoredTheme(theme)
setTheme(theme)
showActiveTheme(theme, true)
})
})
})
})()
// ]]>
</script>
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