woocommerce/plugins/woocommerce-admin/client/layout/header/style.scss

/** @format */

.woocommerce-layout__header {
	background: $white;
	display: flex;
	justify-content: space-between;
	flex-direction: row;
	align-items: center;
	box-sizing: border-box;
	background: $white;
	border-bottom: 1px solid $gray;
	padding: 2px 2px 2px 12px;
	height: 81px;
	position: fixed;
	width: 100%;
	top: 32px;
	z-index: 1000;

	.woocommerce-layout__header-breadcrumbs {
		font-size: 13px;
		font-weight: normal;
		padding: 9px 0 4px 0;
		margin-left: 35px;

		span + span::before {
			content: ' / ';
			color: $gray-text;
			margin: 0 2px 0 2px;
		}
	}
}

.woocommerce-layout__header-panel {
	display: flex;
	flex-direction: row;
	align-items: baseline;
	position: fixed;
	top: 30px;
	right: 32px;
}