CSS Grid: Limit Item Size Using the minmax Function

There's another built-in function to use with grid-template-columns and grid-template-rows called minmax. It's used to limit the size of items when the grid container changes size. To do this you need to specify the acceptable size range for your item. Here is an example:
grid-template-columns: 100px minmax(50px, 200px);
In the code above, grid-template-columns is set to create two columns; the first is 100px wide, and the second has the minimum width of 50px and the maximum width of 200px.

 example of creating 3 columns of min 90px and 1fr max

grid-template-columns: repeat(3, minmax(90px,1fr));


1
2
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4
5

html code 


<style>
  .item1{background:LightSkyBlue;}
  .item2{background:LightSalmon;}
  .item3{background:PaleTurquoise;}
  .item4{background:LightPink;}
  .item5{background:PaleGreen;}
  
  .container {
    font-size: 40px;
    min-height: 300px;
    width: 100%;
    background: LightGray;
    display: grid; 
    grid-template-columns: repeat(3, minmax(90px,1fr));
 
    grid-template-rows: repeat(3,1fr);
    grid-gap: 10px;
  }
</style>
  
<div class="container">
  <div class="item1">1</div>
  <div class="item2">2</div>
  <div class="item3">3</div>
  <div class="item4">4</div>
  <div class="item5">5</div>
</div>
source

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