Border/Container around text doesn't work!

Hallo:)

I have been reading a lot of threads “how to make border/container to text area” and have have tried to do how everybody say it suppose to be done:

ex:

1. add this to the css:
.feature-box {
background-color: #e3f0f2;
border: solid 1px #66cccc;
padding: 10px;
}

(I suppose it is the same place as where I edit for exampel the main-container, background, body ect. – and in my place, that is in standard.css)

2. add this to the post or the page, where you want to add the feature-box:
<div class=”feature-box”>
Some text inside the box.
</div>

I have done this, but without any result. It just writes this on my page:
<div class=”feature-box”>
Some text inside the box.
</div>

What am I doing wrong? I dont know where exact to drop the text in the css? could that be the problem?

Thanks

Frederik