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HTML

              
                <!-- https://i.imgur.com/bbuESjz.jpg -->

<div class="slide">
  <div class="slide-img">
    <img src="https://images.unsplash.com/photo-1423882503395-8571951e45cc?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&w=1080&fit=max&s=f011230f831dba2833a69d7d55a02c20" alt="" />
  </div>
  <div class="slide-body">
    <span class="slide-title">Brilliant Headline</span>
    <span class="slide-text">I on to all taken indeed this happiness their narrow fate person, finds as without very a uniforms, and throughout. Publication cons, the from to bed must place thoroughly, hazardous as to importance, the would been made, then odd fundamentals he to your slight pointing, with pointing and to that.</span>
  </div>
</div>
              
            
!

CSS

              
                // Edit these settings to play with the effect

$img-tolerance: 80px;    // amount the image should hang off the edges (crop)
$img-aspect-ratio: 16/9; // aspect ratio of image container
$duration: 15s;          // how long the ken burns pan lasts

*,*::before,*::after{box-sizing:border-box;}

body {
  font-family:sans-serif;
  padding-top:30px;
  line-height:1.5;
}

.slide {
  width:40%;
  margin:0 auto;
  background-color: #fff;
  box-shadow: 0 1px 5px rgba(0,0,0,.25);
}

.slide-img {
  overflow:hidden;
  position:relative;
  
  &::before {
    content: "";
    display: block;
    padding-bottom: (1 / $img-aspect-ratio) * 100%;
  }
  
  img {
    width: calc(100% + #{$img-tolerance});
    position: absolute;
    top: 50%;
    left: 50%;
    height: auto;
    transform: translateX(-50%) translateY(-50%);
    animation: kenburnsEffect $duration infinite;
    animation-timing-function: linear;
    animation-direction: alternate;
    
    // decreases jankiness
    backface-visibility:hidden;
  }
}

@keyframes kenburnsEffect {
  0% {
    transform:translateX(-50%) translateY(-50%) scale(1);
  }
  100% {
    transform:translateX(-55%) translateY(-30%) scale(1.35);
  }
}

.slide-body {
  padding:6%;
  
  [class*="slide"] {
    display:block;
  }
}

.slide-title {
  font-size: 2rem;
  font-weight:bold;
  margin-bottom:1rem;
}

.slide-text {
  font-size: 1rem;
}
              
            
!

JS

              
                
              
            
!
999px

Console