Ref. https://www.freecodecamp.org/news/html-center-image-css-align-img-center-example/

div {
      text-align: center;
    }

Flexbox
div {
      display: flex;
      justify-content: center;
    }
CSS Grid
div {
      display: grid;
      place-items: center;
    }
Margin Property
img {
      display: block;
      margin: 0 auto;
    }