CSS怎么使网页全部变成灰色

Desaturating a color image couldn’t be simpler with CSS3. We’ll apply the filter as a class, as you’d typically desire several images to be affected by the code at the same time:

img.desaturate { filter: grayscale(100%); }

Naturally, all current browsers implement CSS3 filters via vendor prefixes, so our first job is to insert that code, writing in CSS that does not yet exist in order to future-proof our work:

img.desaturate { filter: grayscale(100%);

-webkit-filter: grayscale(100%);

-moz-filter: grayscale(100%);

filter: grayscale(100%);

}

Applying the class to the image is easy: