如何使用CSS轻松地水平居中<div>？

.parent {
  display: flex;
  justify-content: center;
}

.parent {
  display: grid;
  justify-items: center;
}

.parent {
  text-align: center;
}

.child {
  display: inline-block;
  margin-left: auto;
  margin-right: auto;
}

.parent {
  position: relative;
}

.child {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}