Removing gap between navbar and container

here is my codepen link for personal portfolio page . i want to remove space between my navbar and container .what can i do more to improve my page ? Thanks

Remove margin-top from your body. Designwise: please don’t use Lobster typeface in all caps and as a subhead- it is a display face and needs to be large and was never meant to be set in all caps. If you want to go generic just use Open Sans. Don’t recommend stretching your photos, either.