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HTML 

              
                html
p navigate using arrow keys
.ocean
	#fish
	#boat
		#hook
!

CSS 

              
                
//define colors
$blue: blue
$red: #ff5500
$darkblue: #320efc
//text styles
p
	text-align: center
	font-family: Inconsolata
	color: #101010
	font-size: 14px
	font-weight: 400

//define animation
@keyframes drop
	0%
		margin-top: 100px
	100%
		margin-top: 200px

//define animation
@keyframes drop
	0%
		margin-top: 100px
	100%
		margin-top: 200px


.ocean
	position: fixed
	bottom: 0
	height: 40%
	width: 100%
	background: black
	z-index: -1
	animation: wave 1.4s ease-in-out infinite alternate
	//boat
	#boat
		background: blue
		height: 25px
		width: 50px
		border-radius: 0 0 10px 10px
		position: absolute
		// margin-top: -2%
		z-index: 4
		
	#hook
		background: $red
		height: 50px
		width: 5px
		position: absolute
		top: -5px
		left: 5px
		z-index: 2
		&:after
			content: ""
			background: $red
			width: 15px
			height: 5px
			position: absolute
			bottom: 0
			z-index: 5

	//fish
	#fish
		content: ""
		background: white
		height: 20px
		width: 20px
		position: absolute
		margin-top: 4%
		z-index: 0
		animation: bubble 4s ease-in-out infinite 
		//animation: bubble 4s ease-in-out infinite 
//define animation
@keyframes wave
	0%
		height: 43%
	100%
		height: 40%
//define animation
@keyframes bubble
	0%
		margin-top: 6% 
		left: 100px
		border-radius: 0 10px 10px 0
	30%
		margin-top: 3%  
		left: 400px
		border-radius: 0 10px 10px 0
	56%
		margin-top: 10%
		left: 600px
		border-radius: 10px 0 0 10px
	60%
		margin-top: 10%
		left: 600px
		border-radius: 10px 0 0 10px
	96%
		margin-top: 6% 
		left: 100px
		border-radius: 0 10px 10px 0
	100%
		margin-top: 6% 
		left: 100px
		border-radius: 0 10px 10px 0
@keyframes boatColor
	0%
		background: $blue
		margin-top: -2%
	100%
		background: $darkblue
		margin-top: -1%
!

JS 

              
                //define object boat, with move left and move right
function boatMove(initialPos){
var boat = document.getElementById("boat");
var hook = document.getElementById("hook");
	countX = 1;
	countY = 1;
	//set initial position & hook height
	boat.style.transform="translateX"+"("+initialPos+"px)";
	hook.style.height="5px";
	//set default self-contained animation
	boat.style.animation="boatColor 1s ease-in-out infinite alternate";
	//key controled animation
	window.addEventListener("keydown",function(event){
		//return keycode value
		var keyvalue = event.which || event.keycode;
		//pass in initial position
		x=initialPos;
		if (keyvalue==39){
			boat.style.transform="translateX"+"("+(x+20*countX)+"px)";
		countX +=1;
		}
		if (keyvalue==37){
			boat.style.transform="translateX"+"("+(x+20*countX)+"px)";
		countX -=1;
		}
		if (keyvalue==40){
			hook.style.height=(25+5*countY)+"px";
		countY +=1;
		}
		if (keyvalue==38){
			hook.style.height=(25+5*countY)+"px";
		countY -=1;
		}
	});

}

boatMove(100);
!
999px

Console