<div class="container">
  <img src="[url]">
  <img src="[url]">
  <img src="[url]">
</div>

.container {
  display: flex;
  flex-direction: row;
  height: 300px;
  margin-bottom: 20px;
}

.container img {
  flex: 1;
  object-fit: cover;
}

.container img {
  flex: 1;
  min-width: 1%; /* width of images adjust to the parent container */
  object-fit: cover;
}