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HTML/CSSBeginner#css#layout-puzzle
HTML/CSSAdvanced#css#grid
What is the difference between CSS Grid's implicit and explicit grid?
The explicit grid is defined by grid-template-columns/rows. The implicit grid is auto-generated when content is placed outside those defined tracks, sized by grid-auto-rows/grid-auto-columns (default auto).
Example
.grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-auto-rows: 100px; /* controls implicitly created rows */
}