CANT REMOVE WHITESPACE UNDER NAVIGATION

Located here https://www.mindfulscience.es/

You will notice a white space under the navigation, right before the gray area begins.. If I use the inspect in Google Chrome.. it shows me this

p {
padding-bottom: 1em;
}

is the "culprit"

but if I change that value to 0, it removes my spacing between paragraphs site wide..

not sure what is causing this to happen or how to fix it.. any tips?

Thanks

EJ