JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <a href="" class="background"></a>
  <div class="container">
    Основной контейнер
  </div>
</body>

CSS

body {
  position: relative;
  height: 500px;
  width: 500px;
  padding: 50px 0 0 0;
}
.background {
  background: url('https://image.freepik.com/free-vector/modern-abstract-background_1048-1003.jpg') no-repeat fixed 50% 50%;
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}
.container {
  background: #fff;
  border: 1px solid #000;
  width: 300px;
  height: 100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  padding: 20px;
}