*
{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body
{
	overflow: hidden;
}	
section
{
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
	background: #034071;
}
section .runway
{
	position: relative;
	width: 400px;
	height: 100vh;
	background: #1378bc;
	border-left: 20px solid rgba(0,0,0,0.25);
	border-right: 20px solid rgba(0,0,0,0.25);
	transition: transform 1s;
	transition-delay: 1s;
	transform-origin: top;
}
/* plane fly on click left + hold */
/* plane land when relese left click */
section:active .runway
{
	transform: scaleX(0.7) scaleY(0);
	transition-delay: 0s;
	transform-origin: bottom;
}	
section .runway::before
{
	content: '';
	position: absolute;
	top: 0;
	left: 50%;
	transform: translateX(-50%);
	width: 15px;
	height: 100%;
	background: repeating-linear-gradient(transparent 0%, transparent 50%, #fff 50%, #fff 100%);
	background-size: 20px 320px;
    animation: animateRunway 0.5s linear infinite;
}
/* add effect on 'left click on hold */
section:active .runway::before
{
	animation: animateRunway 0.25s linear infinite;
}	
@keyframes animateRunway
{
	0%
	{
		background-position-y: 0px;
	}
	100%
	{
		background-position-y: 640px;
	}	
}
.plane
{
	position: absolute;
	bottom: 100px;
	max-width: 250px; 
	pointer-events: none;
	filter: drop-shadow(20px 20px 0 rgba(0,0,0,0.5));
	transition: 5s;
}	
section:active .plane
{
	max-width: 500px;
	filter: drop-shadow(200px 200px 0 rgba(0,0,0,0));
}
.clouds
{
	position: absolute;
	left: 0;
	width: 100%;
    height: 100%;
	z-index: 10000;
	pointer-events: none;
	opacity: 0;
	transition: opacity 2s;
	transition-delay: 0s;
}
section:active .clouds
{
	opacity: 1;
	transition-delay: 1s;
}	
.clouds img
{
	position: absolute;
	left: 0;
	width: 800px;
	animation: animateClouds 4s linear infinite;
	animation-delay: calc(-1.5s * var(--i));
}
.clouds2
{
	right: 0;
	transform: rotate(180deg);
}
.clouds2 img
{
	animation: animateClouds2 4s linear infinite;
	animation-delay: calc(-1.5s * var(--i));
}	
@keyframes animateClouds
{
	0%
	{
		transform: translateY(-100%);
	}
	100%
	{
		transform: translateY(100%);
	}	
}	
@keyframes animateClouds2
{
	0%
	{
		transform: translateY(100%);
	}
	100%
	{
		transform: translateY(-100%);
	}	
}