Move header up

Never mind the other css problems with this original theme, I edited out all the css BUT the nav menu and it STILL hangs too low. There’s not supposed to be any space at the top and it’s baffling. I had it once but forgot what I did to get it. Any words of advice?

Thanks. https://buttonknowsbest.com/

#menu {
margin: 0;
position: relative;
display: block; }

.nav {
background: #FFFFFF;
opacity: 0.7;
float: left;
margin: 0;
top: 0;
width: 100%;
z-index: 100; }

.nav ul { list-style: none; }

.nav li {
float: left;
position: relative; }

.nav a {
display: block;
text-decoration: none;
color: #a7afb9;
padding: 10px 10px 10px;
font-size: 13px;
font-weight: bold;
text-align: center; }

.nav ul ul {
display: none;
position: relative;
top: 0;
left: 0;
float: left;
z-index: 99999;
background: #ffffff;
opacity: 0.7; }

.nav ul ul ul {
top: 0;
left: 100%;
background: #ffffff; }

.nav ul ul a {
height: 100px;
line-height: 1.5;
padding: 0;
width: 130px; }

.nav li:hover > a,.nav ul ul:hover > a { color: #ccc; }

.nav ul li:hover > ul { display: none; }