Minimal Genesis button styles.

style.css

button,
input[type="button"],
input[type="reset"],
input[type="submit"],
.button,
.site-container .wp-block-button .wp-block-button__link {
	background-color: #fff;
	border: 4px solid #333;
	border-radius: 30px;
	box-shadow: none;
	color: #333;
	font-family: 'Open Sans', sans-serif;
	font-weight: 700;
}

button:focus,
button:hover,
input[type="button"]:focus,
input[type="button"]:hover,
input[type="reset"]:focus,
input[type="reset"]:hover,
input[type="submit"]:focus,
input[type="submit"]:hover,
.button:focus,
.button:hover,
.site-container .wp-block-button .wp-block-button__link:focus,
.site-container .wp-block-button .wp-block-button__link:hover {
	background-color: #fff;
	border: 4px solid #999;
	box-shadow: none;
	color: #999;
	-webkit-transform: translateY(-1px);
    transform: translateY(-1px);
}

@media only screen and (min-width: 960px) {

	.nav-primary .genesis-nav-menu > .menu-highlight > a {
    	background-color: #fff;
		border: 4px solid #333;
		border-radius: 30px;
		box-shadow: none;
		color: #333;
		font-family: 'Open Sans', sans-serif;
		font-weight: 700;
	}
	
	.nav-primary .genesis-nav-menu > .menu-highlight > a:focus,
	.nav-primary .genesis-nav-menu > .menu-highlight > a:hover {
		background-color: #fff;
		border: 4px solid #999;
		box-shadow: none;
		color: #999;
		-webkit-transform: translateY(-1px);
		transform: translateY(-1px);
	}

}