A subtle border to your photos – a good idea if your color scheme calls for a light-colored border for your images. Sometimes the sky can blend into a surrounding light color, but by setting a small amount of padding we can simulate a double border on our photo:
img {
border: 15px solid #def;
background: #aaa;
padding: 1px;
}The subtle 1px border prevents the photo from ‘bleeding’ into its border.
Supercharge your image borders | Bite Size Standards