Question

I’m not sure why, but I get this text showing / flowing outside of the <h3> tag. I thought it was something to do with floats, but I have tried all the solutions I know to fix it and they haven’t worked.

Here is jsfiddle (I’m in Safari): http://jsfiddle.net/BJCkv/1/

HTML :

<div id="header-container">
    <div class="wrapper"> <!-- has width of 940px; and aligned in middle -->
        <h1>PCSA - TRAINING</h1>
        <h3>Security Architecture</h3> <!-- This is the problem text -->
    </div>
</div>

CSS :

#header-container {
    height: 84px;
    line-height: 84px;
    background-color: #e0dfd9;
    background-image: url(../img/header.png);
    border-top: 1px solid #ccccc7;
    border-bottom: 1px solid #ccccc7;
}
#header-container .wrapper {
    overflow: hidden;
}
#header-container h1 {
    color: #b8622b;
    font-family: 'Open Sans', sans-serif;
    font-size: 38px;
    text-shadow: 0 1px 0 #f7f7f5;
    font-weight: 600;
    float: left;
    background: red;
}
#header-container h3 {
    color: #a5a5a4;
    float: left;
    font-family: 'Open Sans', sans-serif;
    font-style: italic;
    padding: 3px 0 3px 10px;
    margin-left: 20px;
    height: 30px;
    border-left: 1px solid #a5a5a4;
    background: yellow;
}

Answer 1

You can replace height: 30px; with line-height: 30px; That should solve the problem.
http://jsfiddle.net/BJCkv/7/