<h1>Object fit</h1>
<div class="wrapper">
  <div class="container">
    <h2>Fill</h2>
    <div>
      <img class="fill" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg/220px-The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg">
    </div>
  </div>
  <div class="container">
    <h2>Contain</h2>
    <div>
      <img class="contain" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg/220px-The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg">
    </div>
  </div>
   <div class="container">
    <h2>Cover</h2>
    <div>
      <img class="cover" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg/220px-The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg">
    </div>
  </div>
   <div class="container">
    <h2>None</h2>
    <div>
      <img class="none" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg/220px-The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg">
    </div>
  </div>
     <div class="container">
    <h2>Scale down</h2>
    <div>
      <img class="scaleDown" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg/220px-The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg">
    </div>
  </div>
</div>

html {
  color-scheme: dark;
  font-size: 20px;
}

img {
  height: 100%;
  width: 100%;
}

.fill {
  object-fit: fill;
}

.contain {
  object-fit: contain;
}

.cover {
  object-fit: cover;
}

.none {
  object-fit: none;
}

.scaleDown {
  object-fit: scale-down;
}

body {
  background: #292929;
  color: #DFDFDF;
  display: flex;
  align-items: center;
  justify-items: center;
  flex-direction: column;
}

.wrapper {
  display: flex;
  align-items: center;
  justify-items: center;
  flex-direction: row;
}

h1 {
  margin-bottom: 3rem;
  color: #DC89F5;
}

.container {
  margin-right: 1.5rem;
}

.container > div {
  width: 200px;
  height: 150px;  
  background: #1F1F1F;
}