How to make ads centered in sidebar?

Hi there,

We can remove the padding on that widget first with this CSS:

#custom_html-7 {
    padding: 0;
}

Your add is set to a fixed width of 300px. Are you able to change that?

Let me know.

so I just need to add this code in the customizing additional CSS box and thats it?

my ads are 300px, cant change it.

Yup try that first and you can see how it looks.

Your add isn't wide enough to fill the side bar.