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HTML

CSS

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              -
	let pegs = 21;
	let rows = 13;
	let cols = 13;
	
	let i = 0;
	let j = 0;
	let k = 0;
	
while k < pegs
	input(type="radio" class=`peg_${k} peg picker` name="peg" checked=(k===0))
	- k++
	
- k = 0
form#screen
	#board(style=`width: ${(cols+1) * 5.4}vmin; height: ${(rows+1) * 5.4}vmin`)
		button.reset(type="reset")
		while i < rows
			.row
				- j = 0
				while j < ((i % 2 == 0) ? cols : cols+1)
					- k = 0
					.hole(style=`z-index: ${(cols+2) - j}`)
						while k < pegs
							input(type="checkbox" class=`peg_${k} peg`)
							- k++
						.peg-color
					- j++
			- i++

style
	|	.peg_20, #board .peg_20:checked ~ .peg-color { animation: rainbow 10s infinite linear; }
	|	@keyframes rainbow {
	|		0%, 100% { color: #900 }
	|		05.556% { color: #930 } 
	|		11.111% { color: #960 }
	|		16.667% { color: #990 }
	|		22.222% { color: #690 }
	|		27.778% { color: #390 }
	|		33.333% { color: #090 }
	|		38.889% { color: #093 }
	|		44.444% { color: #096 }
	|		50.000% { color: #099 }
	|		55.556% { color: #069 }
	|		61.111% { color: #039 }
	|		66.667% { color: #009 }
	|		72.222% { color: #309 }
	|		77.778% { color: #609 }
	|		83.333% { color: #909 }
	|		88.889% { color: #906 }
	|		94.444% { color: #903 }
	|	}
	
-
	let penfooter = {
		author_id: "seto89",
		author_name: "seto89",
		author_avatar_id: "2463519",
		universal: "KLaMXm",
	}

footer#footer
	#footer__author
		#footer__author__who
			span#footer__author__who--by
			a#footer__author__who--link(href=`https://codepen.io/${penfooter.author_id}` target="_new" style=`--avatar: url(https://s.cdpn.io/profiles/user/${penfooter.author_avatar_id}/80.jpg)`)
				= penfooter.author_name || penfooter.author_id
		#footer__author__follow
			a#footer__author__follow--link(href=`https://codepen.io/${penfooter.author_id}/pen/${penfooter.universal}` target="_new")
            
          
!

CSS

            
              html {
	min-height: 100%;
	min-height: 100vh;
	display: flex;
}
body {
	flex: 1;
	text-align: center;
	background: linear-gradient(to bottom, #000 40vmin, #444 95vmin, #000 98vmin);
}
.peg, .peg:before, .peg:after, .peg-color, .reset {
	transition: all .2s;
}

/* Pegs */
.peg {
	-webkit-appearance: none;
		 -moz-appearance: none;
					appearance: none;
	cursor: pointer;
	border-radius: 100%;
	padding: .5vmin;
	margin: 0;
	padding: 0;
	outline: none;
}

/* Pegs from the Picker */
.peg.picker {
	margin: 1vmin .25vmin;
	padding: 1.5vmin;
}

#screen {
	box-sizing: border-box;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 100%;
	padding: 2.5vmin;
	margin: 0;
}
/* The board */
#board {
	display: flex;
	flex-direction: column;
	
	background-color: #222;
	background-image: repeating-linear-gradient(rgba(0, 0, 0, .25) 0%, transparent 1%);
	border-radius: .5vmin;
	border: 1vmin solid #ddd;
	border-image: radial-gradient(circle, #666, #222) 50;
	box-shadow:
		inset .25vmin .25vmin 1vmin #000,
		inset .1vmin .1vmin 1vmin #000,
		inset 0 0 0 .1vmin #000,
		0 0 0 .1vmin rgba(0, 0, 0, .25)
	;
	position: relative;
}
/* Board Shadow */
#board:before {
	content: "";
	background: #000;
	border-radius: 100%;
	filter: blur(2vw);
	width: 125%;
	margin: 0 -7.5vmin;
	height: 3vmin;
	position: absolute;
	bottom: -3vmin;
	z-index: -1;
}
/* Board Edges */
#board:after {
	content: "";
	border-radius: inherit;
	box-shadow: inset .25vmin .5vmin .25vmin rgba(255, 255, 255, .25), inset -.25vmin -.5vmin .25vmin rgba(0, 0, 0, .25);
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	z-index: 1;
	margin: -1vmin; /* Must be the same value as border */
}

/* Buttons */
#board .reset {
	background-color: #222;
	border: .15vmin solid rgba(0, 0, 0, .25);
	box-shadow: inset .25vmin 0vmin .5vmin rgba(255, 255, 255, .25);
	border-radius: 100% 0 0 100%;
	box-sizing: border-box;
	cursor: pointer;
	padding: 10vmin 1vmin;
	position: absolute;
	left: -4.3%;
	outline: none;
}
#board .reset:focus {
	background-color: #333;
}
#board .reset:active {
	margin-left: 1%;
}

/* The board rows and holes */
#board .row {
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	position: relative;
}
#board .row .hole {
	background-color: #111;
	border-radius: 100%;
	box-shadow: 0 0 0 1px rgba(255, 255, 255, .1), inset 0 0 2vmin #000;
	margin: 0 .3vmin;
	padding: 2.25vmin;
	position: relative;
}
#board .row .hole:focus-within {
	box-shadow: 0 0 0 1px rgba(255, 255, 255, .5);
}

/* The board pegs */
#board .row .hole .peg,
#board .row .hole .peg-color {
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	position: absolute;
	width: 100%;
	height: 100%;
}
#board .row .hole .peg-color {
	border-radius: 100%;
	z-index: 0;
}

/* Selected peg, plugged peg */
.peg_0 , #board .peg_0:checked ~ .peg-color { color: #900; }
.peg_1 , #board .peg_1:checked ~ .peg-color { color: #930; }
.peg_2 , #board .peg_2:checked ~ .peg-color { color: #960; }
.peg_3 , #board .peg_3:checked ~ .peg-color { color: #990; }
.peg_4 , #board .peg_4:checked ~ .peg-color { color: #690; }
.peg_5 , #board .peg_5:checked ~ .peg-color { color: #390; }
.peg_6 , #board .peg_6:checked ~ .peg-color { color: #090; }
.peg_7 , #board .peg_7:checked ~ .peg-color { color: #093; }
.peg_8 , #board .peg_8:checked ~ .peg-color { color: #096; }
.peg_9 , #board .peg_9:checked ~ .peg-color { color: #099; }
.peg_10, #board .peg_10:checked ~ .peg-color { color: #069; }
.peg_11, #board .peg_11:checked ~ .peg-color { color: #039; }
.peg_12, #board .peg_12:checked ~ .peg-color { color: #009; }
.peg_13, #board .peg_13:checked ~ .peg-color { color: #309; }
.peg_14, #board .peg_14:checked ~ .peg-color { color: #609; }
.peg_15, #board .peg_15:checked ~ .peg-color { color: #909; }
.peg_16, #board .peg_16:checked ~ .peg-color { color: #906; }
.peg_17, #board .peg_17:checked ~ .peg-color { color: #903; }
.peg_18, #board .peg_18:checked ~ .peg-color { color: #999; }
.peg_19, #board .peg_19:checked ~ .peg-color { color: #444; }

.peg.picker,
#board .peg:checked ~ .peg-color {
	background-color: currentcolor;
	background-image:
		radial-gradient(circle, rgba(255, 255, 255, .25), transparent),
		radial-gradient(circle, rgba(255, 255, 255, .75), transparent);
	background-blend-mode: hard-light, color-dodge;
	border: .1vmin solid currentcolor;
	box-sizing: border-box;
}
.peg.picker:checked {
	box-shadow: 0 0 1vmin .25vmin currentcolor, inset 0 0 0 .1vmin rgba(255, 255, 255, .25);
	filter: brightness(120%);
	transform: scale(1.25);
}
#board .peg:checked ~ .peg-color {
	box-shadow: inset 0 0 0 .1vmin rgba(255, 255, 255, .25);
}
#board .peg:focus ~ .peg-color {
	transform: scale(1.25);
}
#board .peg:checked ~ .peg-color:after {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	border-radius: 100%;
	box-shadow: 0 0 5vmin 1vmin currentcolor, 0 0 1.5vmin #fff;
	z-index: 1;
	mix-blend-mode: color-dodge;
}

#board .peg {
	display: none;
}
.peg_0.picker:checked ~ #screen #board .peg.peg_0,
.peg_1.picker:checked ~ #screen #board .peg.peg_1,
.peg_2.picker:checked ~ #screen #board .peg.peg_2,
.peg_3.picker:checked ~ #screen #board .peg.peg_3,
.peg_4.picker:checked ~ #screen #board .peg.peg_4,
.peg_5.picker:checked ~ #screen #board .peg.peg_5,
.peg_6.picker:checked ~ #screen #board .peg.peg_6,
.peg_7.picker:checked ~ #screen #board .peg.peg_7,
.peg_8.picker:checked ~ #screen #board .peg.peg_8,
.peg_9.picker:checked ~ #screen #board .peg.peg_9,
.peg_10.picker:checked ~ #screen #board .peg.peg_10,
.peg_11.picker:checked ~ #screen #board .peg.peg_11,
.peg_12.picker:checked ~ #screen #board .peg.peg_12,
.peg_13.picker:checked ~ #screen #board .peg.peg_13,
.peg_14.picker:checked ~ #screen #board .peg.peg_14,
.peg_15.picker:checked ~ #screen #board .peg.peg_15,
.peg_16.picker:checked ~ #screen #board .peg.peg_16,
.peg_17.picker:checked ~ #screen #board .peg.peg_17,
.peg_18.picker:checked ~ #screen #board .peg.peg_18,
.peg_19.picker:checked ~ #screen #board .peg.peg_19,
.peg_20.picker:checked ~ #screen #board .peg.peg_20,
#board .peg:checked {
	display: block;
	z-index: 1;
}
#board .peg:checked {
	z-index: 2;
}

#footer {
	text-align: left;
}
            
          
!

JS

            
              
            
          
!
999px

Console