Ignore parent padding

Question

I\'m trying to get my horizontal rule to ignore the parent padding.

Here\'s a simple example of what I have:

#par         


        

Answer 1

For image purpose you can do something like this

img {
    width: calc(100% + 20px); // twice the value of the parent's padding
    margin-left: -10px; // -1 * parent's padding
}