Check out example codes for "materialize customize container". It will help you in understanding the concepts better.

Code Example 1

.container {
  margin: 0 auto;
  max-width: 1280px;
  width: 90%;
}
@media only screen and (min-width: 601px) {
  .container {
    width: 85%;
  }
}
@media only screen and (min-width: 993px) {
  .container {
    width: 70%;
  }
}

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