At the moment, I have set up variables to manage colors for both light and dark themes (such as --light-background-color, --dark-background-color). Handling two themes is manageable with this approach, but it feels a bit labor-intensive. If more themes were introduced, it could become unfeasible.
I've come across features like night shift that utilize CSS filters to invert colors on a webpage. How do these filters function, and what steps would be necessary to incorporate them?
If you want to simplify your theme color variables, consider using a set of general color variables instead of specific ones for each theme. Define these variables in the body element and override them as needed.
Apply the color variables to your HTML elements as usual, but change the attribute of the body element to switch themes.
Make sure to also have contrasting color variables along with your theme colors. For example, ensure that text remains legible when switching from light to dark backgrounds.
In this example, primary and secondary theme colors are set in the body element and modified when the body has the "dark" class:
document.querySelector("button").addEventListener("click", () => document.body.classList.toggle("dark"));body {
--color-primary: #b4e9ce;
--color-primary-contrast: #000000;
--color-secondary: #308d43;
--color-secondary-contrast: #ffffff;
/* Additional theme colors... */
}
body.dark {
--color-primary: #202d26;
--color-primary-contrast: #ffffff;
--color-secondary: #8f8f8f;
--color-secondary-contrast: #000000;
/* Additional theme colors... */
}
button {
padding: 10px;
margin-bottom: 20px;
}
.wrapper {
padding: 20px;
background-color: var(--color-primary);
border: solid var(--color-secondary) 10px;
}
.wrapper h1 {
font-family: sans-serif;
text-align: center;
color: var(--color-primary-contrast);
}<body>
<button>Toggle Theme</button>
<div class="wrapper">
<h1>Hello World</h1>
</div>
</body>Transforming a Light Theme to Dark with Simple CSS:
<style>
body
{
filter: invert(1);
}
</style>
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