How can I draw a left pointing triangle using CSS?

Question

It has been a long time since I built this triangle which points up. How can I alter my CSS to point the corner left?

http://jsfiddle.net/3sP8q/

Answer 1

Here is how:

.left-corner {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-right: 100px solid red;
    border-bottom: 50px solid transparent;
}

Use CSS-Tricks, it helps a lot!