<header class="header-contents">
</header>
<main class="main-contents">
<label>
<input id="theme" type="checkbox">
<span>ダークテーマ</span>
</label>
</main>
<footer class="footer-contents">
</footer>
:root {
--main-color: #5555ff;
--base-color: #eee;
--text-color: #333;
--contents-width:500px;
}
:root.dark {
--main-color: #333;
--base-color: #000;
--text-color: #fff;
}
* {
box-sizing: border-box;
}
body {
background-color: var(--base-color);
color: var(--text-color);
}
.header-contents {
max-width: calc(var(--contents-width));
background-color: var(--main-color);
width: 100%;
height: 50px;
margin: auto;
}
.main-contents {
max-width: var(--contents-width);
padding: 30px;
width: 100vw;
height: 100px;
margin: auto;
}
.footer-contents {
max-width: calc(var(--contents-width));
background-color: var(--main-color);
width: 100%;
height: 100px;
margin: auto;
}
const inpTheme = document.getElementById("theme");
const html = document.documentElement;
inpTheme.addEventListener("change", ()=>{
if(!inpTheme.checked) {
html.classList.remove("dark");
}
else {
html.classList.add("dark");
}
});
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.