Applying a Grayscale (Black‑and‑White) Effect to a Website Using CSS
This article explains how to turn an entire website black‑and‑white by adding a simple CSS snippet that applies grayscale filters, provides the exact code, and offers guidance on where to insert it in the HTML head for immediate effect.
The page commemorates a national memorial day and shows a quick way to change a website’s appearance to black‑and‑white as a sign of respect.
Grayscale CSS Code
html{
-webkit-filter: grayscale(100%);
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter: grayscale(100%);
filter: gray;
}Adding the above snippet at the top of your CSS file (or inside a <style>...</style> block in the <head> of your HTML) will render the whole site in grayscale.
The article also notes that if a site does not use a CSS file, you can place the code directly between the <head> tags, remembering to wrap it with <style> tags; otherwise it will have no effect.
For sites that use outdated standards, the author suggests updating to the latest web standards to ensure the CSS works correctly.
Although a JavaScript method could achieve the same result, the author recommends the CSS approach for better performance and less impact on page rendering.
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