CSS 实现水平和垂直居中的三种方法

.center-element {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.center-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.center-container {
  display: grid;
  place-items: center;
}