这是什么情况，很神奇？用960网格系统时出现的问题。

Question

为什么会这样？图中所示的哪一行代码始终有问题？

<link rel='stylesheet' type='text/css' media='all' href='reset.css' />
<link rel='stylesheet' type='text/css' media='all' href='960.css' />
<link rel='stylesheet' type='text/css' media='all' href='text.css' />
<link rel='stylesheet' type='text/css' media='all' href='style.css' />



<style>

##sidebar{background-color:red;}
#content{background-color:red;}
#photos{background-color:red;}
#advertisements{background-color:red;}
</style>

<div class='container_12″>


<div id='photos' class='grid_2'>photo’s</div>
<div id='sidebar' class='grid_2 alpha'>sidebar</div>
<div id='content' class='grid_6'>main content</div>
<div id='photos' class='grid_2'>photo’s</div>
<div id='advertisements' class='grid_2 omega'>advertisement</div>
</div>

Answer 1

此处应该是英文单引号

Answer 2

单双引号不能混着用啊亲