woocommerce/plugins/woocommerce-admin/client/settings/style.scss

.woocommerce-admin-page__settings_page {
	.woocommerce-layout__primary {
		margin: 0;
	}
	.woocommerce-layout .woocommerce-layout__main {
		padding-right: 0;
	}
	#wpbody-content {
		background-color: white;
	}
}

.woocommerce-settings-tabs {
	.components-tab-panel__tabs {
		border-bottom: 1px solid lightgray;
		padding: 14px 14px 0 14px;
	}
	.components-tab-panel__tabs-item {
		font-weight: 400;
		border: 2px solid transparent;

		&.active-tab {
			border-bottom: 2px solid blue;
		}
	}
}

.woocommerce-settings-layout {
	width: 100%;
	display: flex;
	gap: 30px;
	padding: 50px 16px 16px 16px;
}

.woocommerce-settings-section-nav {
	width: 300px;
}

.woocommerce-settings-content {
	flex: 1;
}

.woocommerce-settings-section-nav {
	.components-item {
		&.active-section {
			.components-button {
				background-color: lightgray;
			}
		}
	}

	.components-button {
		width: 100%;
		border: none !important;
		box-shadow: none !important;
		padding: 20px 12px;
	}
}

.woocommerce-settings-element {
	display: flex;
	justify-content: space-between;
	margin: 16px 0px;

	&:first-of-type {
		margin: 0;
	}

	h4 {
		margin: 0;
		width: 200px;
	}

	.components-base-control {
		flex: 1;
	}
}