Reply To: How to add ads 468×60 in top replace social widget, and change search bar

Try this in Customizer -> Additional CSS

.socialmedia img {
    height: 60px;
    width: 468px;
}
.socialmedia {
    width: auto;
}

Final result should look like this

https://postimg.cc/2LwyhyXp

Please note that the img URL should be from image uploaded to WP gallery otherwise it may look blurry.