woocommerce/plugins/woocommerce-admin/client/mobile-banner/banner.scss

$element-spacing: 13px;
$banner-height: 56px;

// This class is a hack, added conditionally when displaying the app banner, it
// can be refactored away when the activity panel goes away.
.woocommerce-layout__show-app-banner {
	@include breakpoint( "<782px" ) {
		.woocommerce-layout__header-wrapper {
			padding-top: $banner-height;
		}
	}
}

.woocommerce-mobile-app-banner {
	background-color: $woocommerce-brand-purple;
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	display: flex;
	height: $banner-height;
	align-items: center;
	padding: 0 6px 0 4px;

	@include breakpoint( ">400px" ) {
		padding: 0 $element-spacing 0 10px;
	}

	@include breakpoint( ">782px" ) {
		display: none;
	}

	.gridicon {
		fill: $white;
		margin-right: 10px;
	}

	.components-button.is-secondary {
		margin-left: auto;
		color: $white;
		box-shadow: inset 0 0 0 1px $white;

		&:hover,
		&:active {
			color: $white;
			box-shadow: inset 0 0 0 1px $white;
			background: none;
		}
	}

	.woocommerce-mobile-app-banner__description {
		color: $white;
		margin-left: 8px;

		@include breakpoint( ">400px" ) {
			margin-left: $element-spacing;
		}

		.woocommerce-mobile-app-banner__description__text {
			&:first-child {
				font-weight: bold;
			}

			margin: 0;
			font-size: 10px;

			@include breakpoint( ">400px" ) {
				margin-left: 13px;
				font-size: 13px;
			}
		}
	}
}