Where am I going wrong in adding additional stylesheet in child theme

Hi, I have a contact form which I would like to style in a child theme, but have already used the style.css for an animation.
I named the file wpforms.css which is in twentythirteen-child folder.
The code in it is:

@import url(“../twentythirteen/wpforms”);

#wpforms-78 .wpforms-form {
background-color: red;
padding: 20px 15px;
border: 5px solid #666;
border-radius: 20px;
}

Then in the functions.php the code is:

if anyone could tell me where I am going wrong. Thanks