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HTML 

              
                .container
	.birds.front
		-	for(var x = 1; x <= 12; x++)
			div(class="bird b" + x)
				.body
				.wing1
					.wing2
						.wing3
	.birds.back
		-	for(var x = 1; x <= 12; x++)
			div(class="bird b" + x)
				.body
				.wing1
					.wing2
						.wing3
	.cloud.big
		-	for(var x = 0; x <= 8; x++)
			div(class="circle c" + x)
	.cloud.small
		-	for(var x = 0; x <= 8; x++)
			div(class="circle c" + x)
	.mountain
		.backdrop
		-	for(var x = 0; x <= 4; x++)
			div(class="zig zag" + x)
			.top
			.mid
			.bot
			.base
	.range
		-	for(var x = 1; x <= 7; x++)
			div(class="r" + x)
	-	for(var x = 1; x <= 8; x++)
		div(class="tree treeBack tree" + x)
			.top
			.mid
			.bot
			.base
	.tower
		.shadow
		.flagPole
		.roof1
		.roof2
		.wall
			- for(var x = 1; x <= 5; x++)
				div(class="w" + x)
		.legs
			.left
			.right
			.support1
				.criss
				.cross
				.flat
			.support2
				.criss
				.cross
				.flat
		.railing
			.top
			.bot1
			.bot2
			- for(var x = 1; x <= 9; x++)
				div(class="r" + x)
	-	for(var x = 1; x <= 5; x++)
		div(class="tree treeMid tree" + x)
			.top
			.mid
			.bot
			.base
	-	for(var x = 1; x <= 4; x++)
		div(class="tree treeFront tree" + x)
			.top
			.mid
			.bot
			.base
!

CSS 

              
                $tree1: #2D1427;
$tree2: #5A0831;
$tree3: #CD4D45;
$range: #F46435;
$mountain1: #F59452;
$mountain2: #F47A45;
$wood: #370D09;
$pole: #791819;
$flag: #C63737;
$tower1: #76122C;
$tower2: #C93D3D;
$tower3: #821021;
$tower4: #F4633A;
$tower5: #4B1205;
$tower6: #C13C45;

.container {
	position: relative;
	width: 160px;
	height: 335px;
	background: #FAE0C8;
	border-radius: 100px;
	overflow: hidden;
}

.mountain {
	position: absolute;
	top: 0;
	opacity: 1;
	.backdrop {
		position: absolute;
		top: 80px;
		left: -180px;
		width: 0;
		height: 0;
		border-left: 260px solid transparent;
		border-right: 260px solid transparent;
		border-bottom: 200px solid $mountain1;
	}
	.zig {
		position: absolute;
		width: 0;
		height: 0;
		transform: rotate(217deg);
		&.zag1 {
			top: 83px;
			left: 70px;
			border-left: 10px solid transparent;
			border-right: 10px solid transparent;
			border-bottom: 30px solid $mountain2;	
		}
		&.zag2 {
			top: 94px;
			left: 70px;
			border-left: 20px solid transparent;
			border-right: 20px solid transparent;
			border-bottom: 60px solid $mountain2;	
		}
		&.zag3 {
			top: 115px;
			left: 84px;
			border-left: 30px solid transparent;
			border-right: 30px solid transparent;
			border-bottom: 80px solid $mountain2;	
		}
		&.zag4 {
			top: 137px;
			left: 100px;
			border-left: 40px solid transparent;
			border-right: 40px solid transparent;
			border-bottom: 100px solid $mountain2;	
		}
	}
}

.tree {
	opacity: 1;
	position: absolute;
	& > div {
		position: absolute;
	}
	&.treeFront {
		> div {
			border-bottom-color: $tree1;
		}
		&.tree1 { top: 200px; left: 0px; }
		&.tree2 {	top: 220px; left: 52px; }
		&.tree3 { top: 238px; left: 94px; }
		&.tree4 {	top: 224px;	left: 136px; }
	}
	&.treeMid {
		> div {
			border-bottom-color: $tree2;
		}
		&.tree1 { top: 225px; left: 27px; }
		&.tree2 { top: 232px; left: 67px; }
		&.tree3 { top: 225px; left: 86px; }
		&.tree4 { top: 223px; left: 106px; }
		&.tree5 { top: 215px; left: 127px; }
	}
	&.treeBack {
		> div {
			border-bottom-color: $tree3;
		}
		&.tree1 { top: 202px; left: -12px; }
		&.tree2 { top: 204px; left: 17px; }
		&.tree3 { top: 212px; left: 40px; }
		&.tree4 { top: 210px; left: 60px; }
		&.tree5 { top: 208px; left: 80px; }
		&.tree6 { top: 210px; left: 98px; }
		&.tree7 { top: 204px; left: 115px; }
		&.tree8 { top: 202px; left: 130px; }
	}
	.top {
		border-left: 17px solid transparent;
		border-right: 17px solid transparent;
		border-bottom: 45px solid #000;
	}
	.mid {
		top: 16px;
		left: -7px;
		border-left: 24px solid transparent;
		border-right: 24px solid transparent;
		border-bottom: 58px solid #000;
	}
	.bot {
		top: 30px;
		left: -12px;
		border-left: 29px solid transparent;
		border-right: 29px solid transparent;
		border-bottom: 68px solid #000;
	}
	.base {
		top: 44px;
		left: -16px;
		border-left: 33px solid transparent;
		border-right: 33px solid transparent;
		border-bottom: 75px solid blue;
	}
}

.range {
	position: absolute;
	top: 0;
	opacity: 1;
	> div {
		position: absolute;
		background: $range;
		width: 60px;
		height: 50px;
	}
	.r1 {
		top: 200px;
		left: -22px;
		width: 60px;
		height: 50px;
		transform: rotate(34deg);
	}
	.r2 {
		top: 198px;
		left: -20px;
		transform: rotate(-8deg);
	}
	.r3 {
		top: 205px;
		left: 24px;
		transform: rotate(25deg);
	}
	.r4 {
		top: 205px;
		left: 50px;
		transform: rotate(-28deg);
	}
	.r5 {
		top: 200px;
		left: 88px;
		transform: rotate(14deg);
	}
	.r6 {
		top: 200px;
		left: 100px;
		transform: rotate(-38deg);
	}
	.r7 {
		top: 199px;
		left: 122px;
		transform: rotate(30deg);
	}
}

.tower {
	position: absolute;
	width: 74px;
	margin-top: 108px;
	margin-left: calc(50% - 37px);
	opacity: 1;
	.shadow {
		position: absolute;
		z-index: 9999;
		top: 12px;
		width: 100%;
		height: 42px;
		background: #000;
		clip-path: polygon(50% 0, 100% 40%, 100% 45%, 87% 45%, 87% 90%, 100% 90%, 100% 100%, 60% 100%, 60% 31%, 50% 0);
		opacity: .4;
	}
	.flagPole {
		width: 2px;
		height: 12px;
		background: $pole;
		margin-left: 36px;
		&:after {
			content: '';
			width: 12px;
			height: 6px;
			background: $flag;
			position: absolute;
			display: block;
		}
	}
	.roof1 {
		border-left: 34px solid transparent;
		border-right: 34px solid transparent;
		border-bottom: 15px solid $tower1;
	}
	.roof2 {
		width: 100%;
		height: 3px;
		background: $tower2;
	}
	.wall {
		position: relative;
		width: 76%;
		height: 22px;
		background: $tower3;
		margin-left: 12%;
		padding-top: 4px;
		.w1, .w2, .w3, .w4, .w5 {
			position: absolute;
			width: 8px;
			height: 14px;
			background: $tower4;
		}
		.w1 {
			left: 4px;
		}
		.w2 {
			left: 14px;
		}
		.w3 {
			left: 24px;
		}
		.w4 {
			left: 34px;
		}
		.w5 {
			left: 44px;
		}
	}
	.legs {
		position: relative;
		.left,
		.right {
			position: absolute;
			width: 4px;
			height: 150px;
			background: $wood;
		}
		.left {
			transform: rotate(3deg);
			left: 12px;
		}
		.right {
			transform: rotate(-3deg);
			right: 12px;
		}
		.support1,
		.support2 {
			position: absolute;
			.criss,
			.cross {
				position: absolute;
				left: 35px;
				width: 4px;
				height: 64px;
				background: $wood;
			}
			.criss {
				transform: rotate(45deg);
			}
			.cross {
				transform: rotate(-45deg);
			}
			.flat {
				position: absolute;
				width: 46px;
				height: 4px;
				background: $wood;
				bottom: -55px;
				left: 14px;
			}
		}
		.support1 {
			top: -14px;
		}
		.support2 {
			top: 28px;
		}
	}
	.railing {
		position: relative;
		top: -16px;
		.r1, .r2, .r3, .r4, .r5, .r6, .r7, .r8, .r9 {
			position: absolute;
			width: 2px;
			height: 10px;
			background: $wood;
		}
		.r1 { left: 5px; }
		.r2 {	left: 12px;	}
		.r3 {	left: 20px;	}
		.r4 {	left: 28px;	}
		.r5 {	left: 36px;	}
		.r6 {	left: 44px;	}
		.r7 {	left: 52px;	}
		.r8 {	left: 60px;	}
		.r9 {	right: 5px;	}
		.top,
		.bot1,
		.bot2 {
			position: absolute;
		}
		.top {
			width: 100%;
			height: 2px;
			background: $tower5;
		}
		.bot1 {
			width: 100%;
			height: 4px;
			top: 10px;
			background: $tower6;
		}
		.bot2 {
			width: 80%;
			height: 2px;
			top: 14px;
			left: 8px;
			background: $tower5;
			opacity: 1;
		}
	}
}

.cloud {
	position: absolute;
	width: 162px;
	height: 55px;
	overflow: hidden;
	&.big {
		top: 10px;
		transform: scale(.8);
		animation: bigCloud 4s linear;
		animation-iteration-count: infinite;
		animation-direction: forwards;
	}
	&.small {
		top: 70px;
		transform: scale(.4);
		animation: smallCloud 4s linear;
		animation-iteration-count: infinite;
		animation-direction: forwards;
		animation-delay: 3s;
	}
	.circle {
		position: absolute;
		border-radius: 50%;
		background: #FFF;
	}
	.c1 {
		width: 32px;
		height: 32px;
		bottom: -15px;
	}
	.c2 {
		width: 35px;
		height: 35px;
		left: 20px;
		bottom: 0;
	}
	.c3 {
		width: 25px;
		height: 25px;
		left: 48px;
		bottom: 15px;
	}
	.c4 {
		width: 35px;
		height: 35px;
		left: 65px;
		bottom: 20px;
	}
	.c5 {
		width: 25px;
		height: 25px;
		left: 94px;
		bottom: 16px;
	}
	.c6 {
		width: 30px;
		height: 30px;
		left: 110px;
		bottom: -5px;
	}
	.c7 {
		width: 30px;
		height: 30px;
		left: 132px;
		bottom: -15px;
	}
	.c8 {
		width: 90px;
		height: 90px;
		left: 30px;
		bottom: -55px;
		background: #FFF;
	}
}

@keyframes bigCloud {
	0% {
		transform: translateX(-200px) scale(.8);
	}
	100% {
		transform: translateX(200px) scale(.8);
	}
}

@keyframes smallCloud {
	0% {
		transform: translateX(-200px) scale(.4);
	}
	100% {
		transform: translateX(200px) scale(.4);
	}
}

.birds {
	position: absolute;
	z-index: 9999;
	width: 100px;
	height: 100px;
	&.front {
		animation: flyFront 4s linear;
		animation-direction: forwards;
		animation-iteration-count: infinite;
		animation-delay: .5s;
		top: 200px;
		left: 200px;
	}
	&.back {
		animation: flyBack 4s linear;
		animation-direction: forwards;
		animation-iteration-count: infinite;
		animation-delay: .5s;
		// animation-delay: 3s;
		top: 50px;
		left: -425px;
	}
	.bird {
		position: absolute;
		transform: scale(0.15);
	}
	@for $i from 1 through 12 {
		$delay: random(2) - .5 + s;
		.b#{$i} {
			.wing1 {
				animation: flap .5s ease-in-out;
				animation-iteration-count: infinite;
				//animation-timing-function: ease;
				animation-direction: alternate;
				transform-origin: 0 0;
				//animation-delay: $delay;
				animation-duration: $delay;
			}
		}
	}
	.b1 { top: -30px;	}
	.b2 { top: -20px; left: -15px; }
	.b3 { left: 10px;	}
	.b4 {	top: 15px; left: 20px; }
	.b5 { top: 30px; left: -5px;	}
	.b6 { top: 45px; left: 5px;	}
	.b7 { top: -5px; left: -35px;	}
	.b8 { top: 10px; left: -25px; }
	.b9 { top: 25px; left: -50px; }
	.b10 { top: 40px; left: -40px; }
	.b11 { top: -10px; left: -75px;	}
	.b12 { top: 5px; left: -65px;	}
}
.body {
	clip-path: polygon(0 100%, 20% 20%, 40% 0, 100% 100%, 20% 80%);
	background: #000;
	width: 150px;
	height: 40px;
}

.wing1 {
	position: relative;
	left: 40px;
	top: -20px;
	width: 40px;
	height: 50px;
	background: #000;
	transform: skew(10deg);
	.wing2 {
		position: absolute;
		bottom: -25px;
		left: 13px;
		
		transform: rotate(-5deg);
	}
	.wing3 {
		width: 40px;
		height: 30px;
		background: #000;
		transform: skew(40deg);
	}
}

@keyframes flap {
	0% {
		transform: skew(10deg) rotateX(50deg);
	}
	100% {
		transform: skew(15deg) rotateX(120deg);
	}
}

@keyframes flyFront {
	0% {
		transform: translate3d(0, 0, 0) rotate(15deg);
	}
	100% {
		transform: translate3d(-600px, -150px, 0) rotate(15deg);
	}
}

@keyframes flyBack {
	0% {
		transform: translate3d(0, 0, 0) scale(.6) scaleX(-1) rotate(-15deg);
	}
	100% {
		transform: translate3d(600px, -50px, 0) scale(.6) scaleX(-1) rotate(15deg);
	}
}

// floof
html, body {
	overflow: hidden;
}
body {
	background: #E6FFFF;
	width: 100vw;
	height: 100vh;
	display: flex;
	align-items: center;
  justify-content: center;
}
!

JS 

              
                // Inspired by an article called 100 days of design by Tiantian Xu
// https://uxdesign.cc/100-days-of-motion-design-463526af852f
!
999px

Console