<div class="container">
  <div class="div-to-center">
    <h2>Center me</h2>
    <p>Easy with Flexbox!</p>
    <img src="https://www.thediygolfer.com/wp-content/uploads/2020/12/putting-1200x800.png" width="200" alt="">
  </div>
</div>
.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.div-to-center {
  max-width: 250px;
}

/*
  Style only properties - these do not affect
  the positioning of the container
*/

.div-to-center {
  padding: 20px;
  border: 1px solid grey;
  border-radius: 5px;
  color: #BFA38A;
  background-color: #1D2326;
}

h2 {
  margin: 0;
}

img {
  border-radius: 5px;
  box-shadow: 1px 2px 3px 1px rgba(0,0,0,0.2);
}

External CSS

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External JavaScript

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