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HTML

              
                - const IMG_DATA = {
- 	'dessert 1': 'https://images.unsplash.com/photo-1564844536308-75c540dbf14e?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ', 
- 	'dessert 2': 'https://images.unsplash.com/photo-1548865164-c4e93ca471aa?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ', 
- 	'dessert 3': 'https://images.unsplash.com/photo-1502004960551-dc67f7c24cb3?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ', 
- 	'dessert 4': 'https://images.unsplash.com/photo-1551276705-0503a4b9d38c?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ', 
- 	'dessert 5': 'https://images.unsplash.com/photo-1551529563-9dd66d188764?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ', 
- 	'dessert 6': 'https://images.unsplash.com/photo-1473340186413-a68ba9c2564e?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=950&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ'
- };
- let min = 1, max = 6, val = 6;

mixin grid(col_rule = 'auto-fit')
	article(style=`--col-rule: ${col_rule}`)
		pre.dark
			span.token--prop grid-template-columns
			span.token--punc :
			|  
			span.token--func repeat
			span.token--punc (
			span.token--args
				span.token--arg.token--keyw #{col_rule}
				span.token--punc ,
				|  
				span.token--arg
					span.token--func minmax
					span.token--punc (
					span.token--args
						span.token--arg.token--len
							span.token--num 15
							span.token--unit %
						span.token--punc ,
						|  
						span.token--arg.token--len
							span.token--num 1
							span.token--unit fr
					span.token--punc )
			span.token--punc )
		section.grid
			- for(let i in IMG_DATA)
				img(src=IMG_DATA[i])

body(style=`--min: ${min}; --val: ${val}; --max: ${max}`)
	a(href='https://codepen.io/thebabydino/pen/gOayvpb' target='_blank') Also check out the second version! 😼
	+grid
	+grid('auto-fill')
	form.dark
		label(for='val') Thumbnails per grid:
		input#val(type='range' min=min value=val max=max)
		output(for='val')
              
            
!

CSS

              
                $pad: .5em;
$gap: .5vw;
$c: orange;

$b-arrow: .5*$pad;

$track-w: 15em;
$track-h: .25em;
$track-r: .5*$track-h;

$thumb-d: 1em;
$thumb-r: .5*$thumb-d;

$mover-w: $track-w - $thumb-d;

@mixin track() {
	border: none;
	width: $track-w; height: $track-h;
	border-radius: $track-r;
	background: #e9e9e9
}

@mixin thumb($f: 0) {
	margin-top: $f*($track-r - $thumb-r);
	border: none;
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	background: $c;
	transition: all calc(var(--f)*2s)
}

* {
	box-sizing: inherit;
	margin: 0;
	padding: 0;
	background: transparent;
	font: inherit
}

body {
	box-sizing: border-box;
	display: grid;
	grid-gap: 2*$pad;
	grid-template-rows: max-content 1fr 1fr max-content;
	overflow-x: hidden;
	margin: 0;
	padding: $pad;
	min-width: 375px; min-height: 100vh;
	background: whitesmoke;
	font: 1.25em ubuntu mono, consolas, monaco, monospace;
}

.dark {
	background: #262626;
	color: #d9d9d9
}

a {
	place-self: center;
	padding: .25em .5em;
	border-radius: 5px;
	background: crimson;
	color: #fff;
	font-weight: 900;
	text-decoration: none
}

article { place-self: center stretch }

pre {
	margin: $pad 0;
	padding: $pad;
	border-radius: 5px;
}

.token {
	&--prop { color: #B7E3C0 }
	
	&--func { color: #B8D0DD }
	
	&--keyw {
		display: inline-block;
		padding: 0 .25em;
		border-radius: 3px;
		background: #F8F087;
		color: #222;
		font-weight: 900
	}
	
	&--num { color: #DBBAE5 }
	
	&--unit { color: #F39DD4 }
	
	@media (max-width: 680px) {
		&--prop ~ &--func::before { content: '\A   ' }
	}
	
	@media (max-width: 450px) {
		&--prop ~ &--args > &--arg:not(:first-child)::before { content: '\A          ' }
	}
}

.grid {
	display: grid;
	grid-gap: $gap;
	grid-template-columns: repeat(var(--col-rule, auto-fit), minmax(15%, 1fr));
	
	[style*='auto-fill'] > & {
		background: 
			repeating-linear-gradient(90deg, 
				transparent 0 1px, 
				#e9e9e9 0 calc((100% + #{$gap})/var(--max) - #{$gap} - 1px), 
				transparent 0 calc((100% + #{$gap})/var(--max))) 0 50%/ 100% calc(100% - 2px) no-repeat
	}
}

img {
	place-self: stretch;
	height: Min(25vh, calc(var(--max)*26vh/var(--val)));
	object-fit: cover;
	border-radius: 3px;
	box-shadow: 2px 2px 5px rgba(#000, .5)
}

form {
	--i: var(--wide, 1);
	--not-i: calc(1 - var(--i));
	--focus: 0;
	--not-focus: calc(1 - var(--focus));
	display: grid;
	place-content: center;
	grid-template-columns: max-content $track-w max-content;
	grid-gap: $pad;
	margin: -$pad;
	padding: $pad;
	filter: grayScale(var(--not-focus));
	
	&:focus-within { --focus: 1 }
	
	@media (max-width: 610px) {
		--wide: 0
	}
}

label {
	grid-column: calc(1 + var(--not-i));
	place-self: center var(--wide, end)
}

[type='range'] {
	&, &::-webkit-slider-thumb, 
	&::-webkit-slider-runnable-track { -webkit-appearance: none }

	grid-column: 2;
	grid-row: calc(1 + var(--not-i));
	cursor: pointer;

	&::-webkit-slider-runnable-track {
		@include track()
			}

	&::-moz-range-track {
		@include track()
			}

	&::-webkit-slider-thumb {
		@include thumb(1)
			}

	&::-moz-range-thumb {
		@include thumb()
			}

	&:focus { outline: solid 0 transparent }
}

output {
	grid-column: calc(3 - var(--not-i));
	grid-row: calc(1 + var(--not-i));
	place-self: start;
	transform: 
		translate(calc(var(--not-i)*(#{$thumb-r} + (var(--val) - var(--min))/(var(--max) - var(--min))*#{$mover-w} - 50%)), 
							calc(var(--not-i)*(#{$b-arrow} - 100%)));
	
	&::after {
		display: block;
		border: solid $b-arrow transparent;
		padding: 0 .5em;
		border-radius: calc(#{$b-arrow} + 3px);
		transform-origin: 50% 100%;
		transform: scale(calc(var(--i) + var(--not-i)*var(--focus)));
		background: nth($c, 1) border-box;
		color: #222;
		text-align: center;
		--xy: calc(var(--not-i)*50%) calc(50%*(1 + var(--not-i)));
		--mask:
			linear-gradient(red, red) padding-box, 
			conic-gradient(
					from calc(45deg - var(--not-i)*90deg) 
					at var(--xy), 
					red 0% 25%, transparent 0%) 
				var(--xy)/ 50% 50% no-repeat border-box;
		-webkit-mask: var(--mask);
						mask: var(--mask);
		transition: transform .3s, filter .3s;
		counter-reset: val var(--val);
		content: counter(val)
	}
}
              
            
!

JS

              
                const _BODY = document.body, 
			_GRIDS = [...document.querySelectorAll('.grid')].map(c => ({
				_el: c, 
				_imgs: [...c.querySelectorAll('img')]
			})), 
			_VAL = document.getElementById('val'), 
			FN = ['append', 'remove'];

let val = + _VAL.value;

_VAL.addEventListener('input', e => {
	let new_val = +_VAL.value;
	
	if(val !== new_val) {		
		_GRIDS.forEach(g => {
			let dif = new_val - val, 
					sgn = Math.sign(dif), 
					bit = .5*(1 - sgn);
			
			while(dif !== 0) {
				g._el[`${FN[bit]}Child`](g._imgs[new_val - dif - bit])
				dif -= sgn
			}
		});
	}
	
	_BODY.style.setProperty('--val', val = new_val)
}, false);
              
            
!
999px

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