<div class="container">
  <div class="jumbotron jumbotron-cover-image">
    <div class="container">
        <h1>Hello, world!</h1>
        <p>...</p>
    </div>
  </div>
</div>

body {
  background-color: #050f2c;
  text-align: center;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.jumbotron-cover-image {
        position: relative;
        background: #000 url("https://images.unsplash.com/photo-1605184861733-be9f5814095e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=641&q=80") center center;
        width: 100%;
        height: 100%;
        background-size: cover;
        color: #fff;
  text-align: left;
}