css – Div并排,无浮点

我知道我可以使用float：left on they and that will work … but on step 5 and 6 in here http://www.barelyfitz.com/screencast…s/positioning/
男人说这是可能的，我不能得到它的工作虽然…

码：

<style>
div.left {
    BACkground:blue;
    height:200px;
    width:300px;
}

div.right{
    BACkground:green;
    height:300px;
    width:100px;
}

.container{
    BACkground:black;
    height:400px;
    width:450px;
}
</style>

<div class="container">
        <div class="left">
            LEFT
        </div>
        <div class="right">
            RIGHT
        </div>
</div>