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HTML

              
                <div class="pixels"></div>

<p><a href="https://1-notes.com/css-pixel-art/" target="_blank" rel="noopener">CSS | 簡単なドット絵を作成する方法 | ONE NOTES</a></p>
              
            
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CSS

              
                .pixels{
	position: relative;
	width: 100px;
	height: 100px;
	background: #000;
}

.pixels::after{
	content: "";
	/* ドットサイズ */
	width: 10px;
	height: 10px;
	/* 位置(box-shadowは1サイズ下にずれるのでtopを調節)*/
	position: absolute;
	top: -10px;
	left: 0px;
	
	/*ドット部分 */
	box-shadow:
		/* 1段目 */
		 0px 10px #64DD17,
		10px 10px #64DD17,
		20px 10px #64DD17,
		30px 10px #64DD17,
		40px 10px #64DD17,
		50px 10px #64DD17,
		60px 10px #64DD17,
		70px 10px #64DD17,
		80px 10px #388E3C,
		90px 10px #1B5E20,
		/* 2段目 */
		 0px 20px #795548,
		10px 20px #795548,
		20px 20px #795548,
		30px 20px #795548,
		40px 20px #795548,
		50px 20px #795548,
		60px 20px #795548,
		70px 20px #795548,
		80px 20px #5D4037,
		90px 20px #3E2723,
		/* 3段目 */
		 0px 30px #795548,
		10px 30px #795548,
		20px 30px #FFFF8D,
		30px 30px #795548,
		40px 30px #795548,
		50px 30px #795548,
		60px 30px #795548,
		70px 30px #FFFF8D,
		80px 30px #5D4037,
		90px 30px #3E2723,
		/* 4段目 */
		 0px 40px #795548,
		10px 40px #795548,
		20px 40px #795548,
		30px 40px #795548,
		40px 40px #795548,
		50px 40px #795548,
		60px 40px #795548,
		70px 40px #795548,
		80px 40px #5D4037,
		90px 40px #3E2723,
		/* 5段目 */
		 0px 50px #795548,
		10px 50px #795548,
		20px 50px #795548,
		30px 50px #795548,
		40px 50px #795548,
		50px 50px #795548,
		60px 50px #795548,
		70px 50px #795548,
		80px 50px #5D4037,
		90px 50px #3E2723,
		/* 6段目 */
		 0px 60px #795548,
		10px 60px #795548,
		20px 60px #795548,
		30px 60px #795548,
		40px 60px #FFFF8D,
		50px 60px #795548,
		60px 60px #795548,
		70px 60px #795548,
		80px 60px #5D4037,
		90px 60px #3E2723,
		/* 7段目 */
		 0px 70px #795548,
		10px 70px #795548,
		20px 70px #795548,
		30px 70px #795548,
		40px 70px #795548,
		50px 70px #795548,
		60px 70px #795548,
		70px 70px #FFFF8D,
		80px 70px #5D4037,
		90px 70px #3E2723,
		/* 8段目 */
		 0px 80px #795548,
		10px 80px #795548,
		20px 80px #795548,
		30px 80px #795548,
		40px 80px #795548,
		50px 80px #795548,
		60px 80px #795548,
		70px 80px #795548,
		80px 80px #5D4037,
		90px 80px #3E2723,
		/* 9段目 */
		 0px 90px #795548,
		10px 90px #795548,
		20px 90px #795548,
		30px 90px #795548,
		40px 90px #795548,
		50px 90px #FFFF8D,
		60px 90px #795548,
		70px 90px #795548,
		80px 90px #5D4037,
		90px 90px #3E2723,
		/* 10段目 */
		 0px 100px #795548,
		10px 100px #795548,
		20px 100px #795548,
		30px 100px #795548,
		40px 100px #795548,
		50px 100px #795548,
		60px 100px #795548,
		70px 100px #795548,
		80px 100px #5D4037,
		90px 100px #3E2723;
}
              
            
!

JS

              
                
              
            
!
999px

Console