[Theme Twenty Elevan] Help with Header

I changed the header for my website. But I’m having trouble getting it to look right. I changed the header dimensions.

// The height and width of your custom header.
	// Add a filter to twentyeleven_header_image_width and twentyeleven_header_image_height to change these values.
	define( 'HEADER_IMAGE_WIDTH', apply_filters( 'twentyeleven_header_image_width', 1000 ) );
	define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'twentyeleven_header_image_height', 96 ) );

And uploaded and changed the header image. However I still have a strange line at the top of my header. Can anyone help?

https://db.tt/QgKfuLg0 (Chrome)
https://db.tt/Up8uXVjG (IE 9)