How do I inspect the exact default CSS coloring schemes for a browser?

by Adrian Carriger

HTML

<textarea class="red"></textarea>
<textarea class="yellow"></textarea>
<textarea class="blue"></textarea>
<textarea class="lime"></textarea>

CSS

textarea {
    height: 100px;
    margin: 10px;
}
.red:focus {
    outline-color: red;
}
.yellow:focus {
    outline-color: yellow;
}
.blue:focus {
    outline-color: blue;
}
.lime:focus {
    outline-color: lime;
}