how i can reduce the leading in the menu?

Hi, how i can reduce the leading in the menu?
i try modify style.css in the root but i can see any change.

#primary-menu-trigger,
#page-menu-trigger {
	display: -ms-flex;
	display: flex;
	opacity: 1;
	pointer-events: auto;
	z-index: 1;
	cursor: pointer;
	font-size: 0.875rem;
	width: 50px;
	height: 35px; /* original 50px */ 
	line-height: 35px; /* original 50px */
	justify-content: center;
	align-items: center;
	-webkit-transition: opacity .3s ease;
	transition: opacity .3s ease;

very thanks for the tip. (i attach reference image)