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/* HEADER  */

.header-container {
  display: flex;
  justify-content: center;
  text-align: center;
  position: relative;
}

.header-items img {
  height: 1100px;
}

.header-items {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-item1 h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 80px;
}

<header>
  <div class="header-container">
    <div class="header-item1">
        <h1>NEW BEGINNING</h1>
    </div>
    <div class="header-items">
      <img src="img/header.jpg" alt="">
    </div>
  </div>
</header>