Make the child full width, going outside the parent container size.

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.child {
  width: 100vw;
  position: relative;
  left: calc(-50vw + 50%);
}

Make the child 30% wider than the parent container.

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.child {
  width: 130%;
  position: relative;
  left: calc(-65% + 50%);
}
Topics: CSS