Why is this simple CSS definition not working?

HTML

<div class="span-24 last">
     Blah
</div>

Some of you might recognize that I'm using a grid system ( defined by my blueprint's grid.css)

Not working

div
{
    border: 1px solid black;
}

Working

.last
{
    border: 1px solid black;
}

What could be the problem, have I missed something important in my CSS learning ?

Anser Wiki

I got the answer to the question, I know it sounds stupid but there it is ->

I was using Eric Meyer's Reset.css, and it overrides the div's开发者_开发技巧 border property to 0.

You can solve this by making sure that reset.css is the first stylesheet that gets loaded.

---

I got the answer to the question, I know it sounds stupid but there it is ->

I was using Eric Meyer's Reset.css, and it overrides the div's border property to 0.

You can solve this by making sure that reset.css is the first stylesheet that gets loaded.

---

Here is a demo: http://jsfiddle.net/yzjJn/. Maybe some CSS is overriding its class...

div {
  border: 1px solid red;
}

<div class="span-24 last">
  Blah
</div>