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Two important selectors to determine the grid cols & rows are as follows
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/* game */
.tthunt-game{
	margin:0 auto;
	width:600px;
	max-width:100%;
	min-height:400px;
}
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/* board */
.tthunt-board{
	display:grid;
	grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
	grid-column-gap:2vw;
	grid-row-gap:2vw;
}
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