To target only webkit, which includes Google and Safari, encompass all the CSS that you want to use just to target Webkit in the following @media block:

@media screen and (-webkit-min-device-pixel-ratio:0) { .myClass { background-color: #FF0000; } #myId {color: #0000FF;} p, a, li {text-shadow: 3px 3px 3px rgba(0, 0, 0, 0.4);} }

Put the above code anywhere in your CSS file. The other browsers will read the rest, but only webkit reads the -webkit-min-device-pixel-ratio of the declaration, and therefore only Chrome and Safari will abide by the rules in the CSS code block.

The important stuff to learn:

@media screen and (-webkit-min-device-pixel-ratio:0) { /* put webkit CSS here*/ }