CSS style doesn't apply to container div

Question

CSS style works (as far as I can see) for all elements except the container div. I can't get it to work, I have tried everything. It should have width and height and a black background color. This is the code that doesn't apply :

#container {
    width: 588px;
    height: 617px;
    background-color:#000;
    margin: auto;    
}

The code seems right. Both CSS and HTML have passed the w3c validators.

Please help, I'm clueless. Thank you.

Answer 1

right now, looking at the html of your page, you have set the container tag as a class. You need to set it either as a div id, or change it to a class in the css.

so in the code above, simply change the # to a . (period) in front of container

.container {   /* replaced # with a period */
    width: 588px;
    height: 617px;
    background-color:#000;
    margin: auto;    
}

Answer 2

你的容器是一个class而不是一个id