Александр

<div class="image-container">
  <img src="image.jpg" alt="Image" onerror="this.src='https://komfort-pluss.ru/wp-content/uploads/2020/01/net-izobrazheniya.jpg'">
  <img src="image1.jpg" alt="Image" onerror="this.src='https://komfort-pluss.ru/wp-content/uploads/2020/01/net-izobrazheniya.jpg'">
  <img src="https://x-files.site/images/articles/96/1/7/sibsup_t3.jpg" alt="Image" onerror="this.src='https://komfort-pluss.ru/wp-content/uploads/2020/01/net-izobrazheniya.jpg'">
</div>

<style>
.image-container {
  position: relative;
}

.image-container img {
  width: 200px;
  height: auto;
}

.image-container::before {
  /* content: "Изображение не загрузилось"; */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #000;
  font-size: 18px;
  font-weight: bold;
  text-align: center;
}
</style>