diff --git a/shared/naturalcrit/splitPane/splitPane.jsx b/shared/naturalcrit/splitPane/splitPane.jsx
index 23ae5d321..1500c759f 100644
--- a/shared/naturalcrit/splitPane/splitPane.jsx
+++ b/shared/naturalcrit/splitPane/splitPane.jsx
@@ -1,200 +1,110 @@
 require('./splitPane.less');
 const React = require('react');
-const createClass = require('create-react-class');
-const cx = require('classnames');
+const { useState, useEffect } = React;
 
-const SplitPane = createClass({
-	displayName     : 'SplitPane',
-	getDefaultProps : function() {
-		return {
-			storageKey         : 'naturalcrit-pane-split',
-			onDragFinish       : function(){}, //fires when dragging
-			showDividerButtons : true
-		};
-	},
+const storageKey = 'naturalcrit-pane-split';
 
-	getInitialState : function() {
-		return {
-			currentDividerPos : null,
-			windowWidth       : 0,
-			isDragging        : false,
-			moveSource        : false,
-			moveBrew          : false,
-			showMoveArrows    : true
-		};
-	},
+const SplitPane = (props)=>{
+	const {
+		onDragFinish = ()=>{},
+		showDividerButtons = true
+	} = props;
 
-	pane1 : React.createRef(null),
-	pane2 : React.createRef(null),
+	const [isDragging, setIsDragging] = useState(false);
+	const [dividerPos, setDividerPos] = useState(null);
+	const [moveSource, setMoveSource] = useState(false);
+	const [moveBrew, setMoveBrew] = useState(false);
+	const [showMoveArrows, setShowMoveArrows] = useState(true);
+	const [liveScroll, setLiveScroll] = useState(false);
 
-	componentDidMount : function() {
-		const dividerPos = window.localStorage.getItem(this.props.storageKey);
-		if(dividerPos){
-			this.setState({
-				currentDividerPos : this.limitPosition(dividerPos, 0.1*(window.innerWidth-13), 0.9*(window.innerWidth-13)),
-				userSetDividerPos : dividerPos,
-				windowWidth       : window.innerWidth
-			});
-		} else {
-			this.setState({
-				currentDividerPos : window.innerWidth / 2,
-				userSetDividerPos : window.innerWidth / 2
-			});
-		}
-		window.addEventListener('resize', this.handleWindowResize);
+	useEffect(()=>{
+		const savedPos = window.localStorage.getItem(storageKey);
+		setDividerPos(savedPos ? limitPosition(savedPos, 0.1 * (window.innerWidth - 13), 0.9 * (window.innerWidth - 13)) : window.innerWidth / 2);
+		setLiveScroll(window.localStorage.getItem('liveScroll') === 'true');
 
-		// This lives here instead of in the initial render because you cannot touch localStorage until the componant mounts.
-		const loadLiveScroll = window.localStorage.getItem('liveScroll') === 'true';
-		this.setState({ liveScroll: loadLiveScroll });
-	},
+		window.addEventListener('resize', handleResize);
+		return ()=>window.removeEventListener('resize', handleResize);
+	}, []);
 
-	componentWillUnmount : function() {
-		window.removeEventListener('resize', this.handleWindowResize);
-	},
+	const limitPosition = (x, min = 1, max = window.innerWidth - 13)=>Math.round(Math.min(max, Math.max(min, x)));
 
-	handleWindowResize : function() {
-		// Allow divider to increase in size to last user-set position
-		// Limit current position to between 10% and 90% of visible space
-		const newLoc = this.limitPosition(this.state.userSetDividerPos, 0.1*(window.innerWidth-13), 0.9*(window.innerWidth-13));
-
-		this.setState({
-			currentDividerPos : newLoc,
-			windowWidth       : window.innerWidth
-		});
-	},
-
-	limitPosition : function(x, min = 1, max = window.innerWidth - 13) {
-		const result = Math.round(Math.min(max, Math.max(min, x)));
-		return result;
-	},
-
-	handleUp : function(e){
+	//when resizing, the divider should grow smaller if less space is given, then grow back if the space is restored, to the original position
+	const handleResize = () =>setDividerPos(limitPosition(window.localStorage.getItem(storageKey), 0.1 * (window.innerWidth - 13), 0.9 * (window.innerWidth - 13)));
+	
+	const handleUp =(e)=>{
 		e.preventDefault();
-		if(this.state.isDragging){
-			this.props.onDragFinish(this.state.currentDividerPos);
-			window.localStorage.setItem(this.props.storageKey, this.state.currentDividerPos);
+		if(isDragging) {
+			onDragFinish(dividerPos);
+			window.localStorage.setItem(storageKey, dividerPos);
 		}
-		this.setState({ isDragging: false });
-	},
+		setIsDragging(false);
+	};
 
-	handleDown : function(e){
+	const handleDown = (e)=>{
 		e.preventDefault();
-		this.setState({ isDragging: true });
-		//this.unFocus()
-	},
-
-	handleMove : function(e){
-		if(!this.state.isDragging) return;
+		setIsDragging(true);
+	};
 
+	const handleMove = (e)=>{
+		if(!isDragging) return;
 		e.preventDefault();
-		const newSize = this.limitPosition(e.pageX);
-		this.setState({
-			currentDividerPos : newSize,
-			userSetDividerPos : newSize
-		});
-	},
+		setDividerPos(limitPosition(e.pageX));
+	};
 
-	liveScrollToggle : function() {
-		window.localStorage.setItem('liveScroll', String(!this.state.liveScroll));
-		this.setState({ liveScroll: !this.state.liveScroll });
-	},
-	/*
-	unFocus : function() {
-		if(document.selection){
-				document.selection.empty();
-		}else{
-			window.getSelection().removeAllRanges();
-		}
-	},
-	*/
+	const liveScrollToggle = ()=>{
+		window.localStorage.setItem('liveScroll', String(!liveScroll));
+		setLiveScroll(!liveScroll);
+	};
 
-	setMoveArrows : function(newState) {
-		if(this.state.showMoveArrows != newState){
-			this.setState({
-				showMoveArrows : newState
-			});
-		}
-	},
-
-	renderMoveArrows : function(){
-		if(this.state.showMoveArrows) {
-			return <>
-				<div className='arrow left'
-					style={{ left: this.state.currentDividerPos-4 }}
-					onClick={()=>this.setState({ moveSource: !this.state.moveSource })} >
-					<i className='fas fa-arrow-left' />
-				</div>
-				<div className='arrow right'
-					style={{ left: this.state.currentDividerPos-4 }}
-					onClick={()=>this.setState({ moveBrew: !this.state.moveBrew })} >
-					<i className='fas fa-arrow-right' />
-				</div>
-				<div id='scrollToggleDiv' className={this.state.liveScroll ? 'arrow lock' : 'arrow unlock'}
-					style={{ left: this.state.currentDividerPos-4 }}
-					onClick={this.liveScrollToggle} >
-					<i id='scrollToggle' className={this.state.liveScroll ? 'fas fa-lock' : 'fas fa-unlock'} />
-				</div>
-			</>;
-		}
-	},
-
-	renderDivider : function(){
-		return <>
-			{this.props.showDividerButtons && this.renderMoveArrows()}
-			<div className='divider' onPointerDown={this.handleDown} >
-				<div className='dots'>
-					<i className='fas fa-circle' />
-					<i className='fas fa-circle' />
-					<i className='fas fa-circle' />
-				</div>
+	const  renderMoveArrows = (showMoveArrows &&
+		<>
+			<div className='arrow left'
+				onClick={()=>setMoveSource(!moveSource)} >
+				<i className='fas fa-arrow-left' />
 			</div>
-		</>;
-	},
+			<div className='arrow right'
+				onClick={()=>setMoveBrew(!moveBrew)} >
+				<i className='fas fa-arrow-right' />
+			</div>
+			<div id='scrollToggleDiv' className={liveScroll ? 'arrow lock' : 'arrow unlock'}
+				onClick={liveScrollToggle} >
+				<i id='scrollToggle' className={liveScroll ? 'fas fa-lock' : 'fas fa-unlock'} />
+			</div>
+		</>
+	);
 
-	render : function(){
-		return <div className='splitPane' onPointerMove={this.handleMove} onPointerUp={this.handleUp}>
-			<Pane
-				width={this.state.currentDividerPos}
-			>
-				{React.cloneElement(this.props.children[0], {
-					...(this.props.showDividerButtons && {
-						moveBrew      : this.state.moveBrew,
-						moveSource    : this.state.moveSource,
-						liveScroll    : this.state.liveScroll,
-						setMoveArrows : this.setMoveArrows,
-					}),
-				})}
+	const renderDivider = (
+		<div className={`divider ${isDragging && 'dragging'}`} onPointerDown={handleDown}>
+			{showDividerButtons && renderMoveArrows}
+			<div className='dots'>
+				<i className='fas fa-circle' />
+				<i className='fas fa-circle' />
+				<i className='fas fa-circle' />
+			</div>
+		</div>
+	);
+
+	return (
+		<div className='splitPane' onPointerMove={handleMove} onPointerUp={handleUp}>
+			<Pane width={dividerPos} moveBrew={moveBrew} moveSource={moveSource} liveScroll={liveScroll} setMoveArrows={setShowMoveArrows}>
+				{props.children[0]}
 			</Pane>
-			{this.renderDivider()}
-			<Pane isDragging={this.state.isDragging}>{this.props.children[1]}</Pane>
-		</div>;
-	}
-});
+			{renderDivider}
+			<Pane isDragging={isDragging}>{props.children[1]}</Pane>
+		</div>
+	);
+};
 
-const Pane = createClass({
-	displayName     : 'Pane',
-	getDefaultProps : function() {
-		return {
-			width : null
-		};
-	},
-	render : function(){
-		let styles = {};
-		if(this.props.width){
-			styles = {
-				flex  : 'none',
-				width : `${this.props.width}px`
-			};
-		} else {
-			styles = {
-				pointerEvents : this.props.isDragging ? 'none' : 'auto' //Disable mouse capture in the rightmost pane; dragging into the iframe drops the divider otherwise
-			};
-		}
+const Pane = ({ width, children, isDragging, moveBrew, moveSource, liveScroll, setMoveArrows })=>{
+	const styles = width
+		? { flex: 'none', width: `${width}px` }
+		: { pointerEvents: isDragging ? 'none' : 'auto' }; //Disable mouse capture in the right pane; else dragging into the iframe drops the divider
 
-		return <div className={cx('pane', this.props.className)} style={styles}>
-			{this.props.children}
-		</div>;
-	}
-});
+	return (
+		<div className='pane' style={styles}>
+			{React.cloneElement(children, { moveBrew, moveSource, liveScroll, setMoveArrows })}
+		</div>
+	);
+};
 
 module.exports = SplitPane;
diff --git a/shared/naturalcrit/splitPane/splitPane.less b/shared/naturalcrit/splitPane/splitPane.less
index e5b3dd7f8..8b61097be 100644
--- a/shared/naturalcrit/splitPane/splitPane.less
+++ b/shared/naturalcrit/splitPane/splitPane.less
@@ -1,69 +1,68 @@
 
-.splitPane{
+.splitPane {
 	position       : relative;
 	display        : flex;
+	flex-direction : row;
 	height         : 100%;
 	outline        : none;
-	flex-direction : row;
-	.pane{
+	.pane {
+		flex       : 1;
 		overflow-x : hidden;
 		overflow-y : hidden;
-		flex       : 1;
 	}
-	.divider{
-		touch-action     : none;
+	.divider {
+		position         : relative;
 		display          : table;
-		height           : 100%;
 		width            : 15px;
-		cursor           : ew-resize;
-		background-color : #bbb;
+		height           : 100%;
 		text-align       : center;
-		.dots{
+		touch-action     : none;
+		cursor           : ew-resize;
+		background-color : #BBBBBB;
+		.dots {
 			display        : table-cell;
-			vertical-align : middle;
 			text-align     : center;
-			i{
+			vertical-align : middle;
+			i {
 				display   : block !important;
 				margin    : 10px 0px;
 				font-size : 6px;
-				color     : #666;
+				color     : #666666;
 			}
 		}
-		&:hover{
-			background-color: #999;
-		}
+		&:hover,&.dragging { background-color : #999999; }
 	}
-	.arrow{
+	.arrow {
 		position         : absolute;
+		left             : 50%;
+		z-index          : 999;
 		width            : 25px;
 		height           : 25px;
-		border           : 2px solid #bbb;
-		border-radius    : 15px;
-		text-align       : center;
 		font-size        : 1.2em;
+		text-align       : center;
 		cursor           : pointer;
-		background-color : #ddd;
-		z-index          : 999;
-		box-shadow      : 0 4px 5px #0000007f;
-		&.left{
+		background-color : #DDDDDD;
+		border           : 2px solid #BBBBBB;
+		border-radius    : 15px;
+		box-shadow       : 0 4px 5px #0000007F;
+		translate        : -50%;
+		&.left {
 			.tooltipLeft('Jump to location in Editor');
 			top : 30px;
 		}
-		&.right{
+		&.right {
 			.tooltipRight('Jump to location in Preview');
 			top : 60px;
 		}
-		&.lock{
+		&.lock {
 			.tooltipRight('De-sync Editor and Preview locations.');
-			top : 90px;
-			background: #666;
+			top        : 90px;
+			background : #666666;
 		}
-		&.unlock{
+		&.unlock {
 			.tooltipRight('Sync Editor and Preview locations');
 			top : 90px;
 		}
-		&:hover{
-			background-color: #666;
-		}
+		&:hover { background-color : #666666; }
 	}
 }