Easily identify which environment you are working within.

Add data-environment to the root element (preferably <html> )

Options:

data-environment="develop" : Development environment
data-environment="qa" : QA environment
data-environment="staging" : Staging environment

Apply this CSS to project:

@-webkit-keyframes toggleEnvironmentNotice {
	0% {
		-webkit-transform: translateY(-100%);
		transform: translateY(-100%);
	}
	1.5%, 25%, 75% {
		-webkit-transform: translateY(0%);
		transform: translateY(0%);
	}
	76.5%, 98.5%, 100% {
		-webkit-transform: translateY(-100%);
		transform: translateY(-100%);
	}
}

@keyframes toggleEnvironmentNotice {
	0% {
		-webkit-transform: translateY(-100%);
		transform: translateY(-100%);
	}
	1.5%, 25%, 75% {
		-webkit-transform: translateY(0%);
		transform: translateY(0%);
	}
	76.5%, 98.5%, 100% {
		-webkit-transform: translateY(-100%);
		transform: translateY(-100%);
	}
}

[data-environment]:before {
	position: fixed;
	top: 0;
	right: 0;
	left: 0;
	z-index: 10000;
	display: block;
	text-align: center;
	background: red;
	padding: 0.5em 3.333em 0.667em;
	line-height: 1;
	font-family: sans-serif;
	font-weight: bold;
	text-transform: uppercase;
	letter-spacing: 0.833em;
	font-size: 6px;
	box-shadow: 0 0.167em 0.333em rgba(0, 0, 0, 0.1), 0 0.833em 1.667em rgba(0, 0, 0, 0.12), 0 -0.167em 0.167em rgba(255, 255, 255, 0.5) inset;
	background: -webkit-gradient(linear, left top, right top, from(rgba(255, 255, 255, 0)), color-stop(21%, var(--background)), color-stop(79%, var(--background)), to(rgba(255, 255, 255, 0)));
	background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, var(--background) 21%, var(--background) 79%, rgba(255, 255, 255, 0) 100%);
	-webkit-filter: opacity(90%);
	filter: opacity(90%);
	-webkit-transform: translateY(-100%);
	transform: translateY(-100%);
	will-change: filter transform;
	-webkit-animation-name: toggleEnvironmentNotice;
	animation-name: toggleEnvironmentNotice;
	-webkit-animation-duration: 30s;
	animation-duration: 30s;
	-webkit-animation-delay: 150ms;
	animation-delay: 150ms;
	-webkit-animation-timing-function: ease-in-out;
	animation-timing-function: ease-in-out;
	-webkit-animation-iteration-count: infinite;
	animation-iteration-count: infinite;
}

[data-environment*="stag"]:before {
	--background: #F83030;
	content: "Staging Environment";
	color: #FFF;
}

[data-environment*="dev"]:before {
	--background: #00AEFF;
	content: "Development Environment";
}

[data-environment="qa"]:before {
	--background: #00CD7D;
	content: "QA Environment";
}

You can apply JS to auto-add the data-environment .
JS also removes data-environment when double tap of " ESC key".