Check out example codes for "responsive css grid". It will help you in understanding the concepts better.

Code Example 1

@supports (display: grid) {
  main { 
    max-width: 10000px;
    margin: 0;
  }
  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 2fr));
    grid-gap: 1rem;
  }
}

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