Changing Flipcard Default Background Color in Blogger Dynamic View

Before
After
When you do not have an image to be used as thumbnail for a given flipcard, by default, the front card would assume a greyish background color. Here's how you can change this default color.

Go to Template Designer - Advanced - Add CSS - paste the following code - Press enter after the last character of the last line } - Apply to Blog.
.flipcard .items .item .card .front, .flipcard .items .item .card .back{
background-color: white !important;
}
To change the color, simply replace the word 'white' in Line 2 above. You can either use simple color text such as 'red', 'green' 'blue' etc, or, you can generate your own hex color tag if you prefer to use a specific color.