Just add this style body in your HTML header
<style>
body{
filter:gray;
-webkit-filter:grayscale(100%);
-moz-filter:grayscale(100%);
-ms-filter:grayscale(100%);
-o-filter:grayscale(100%);
filter:grayscale(100%);
}
</style>
My personal documentations
Just add this style body in your HTML header
<style>
body{
filter:gray;
-webkit-filter:grayscale(100%);
-moz-filter:grayscale(100%);
-ms-filter:grayscale(100%);
-o-filter:grayscale(100%);
filter:grayscale(100%);
}
</style>