Centering in CSS

.content-center {
  display: grid;
  place-content: center;
}

.gentle-flex {
  display: flex;
  justify-content: center;
  align-items: center;
}

.autobot {
  display: flex;
}
 
.autobot > * {
  margin: auto;
}

.parent {
  position: relative;
}
 
.child {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}