html {
    margin: 0;
}

body {
    margin: 0;
    box-sizing: border-box;
}

.gallery {
  display: flex;
  width: 100%;
  height: 100vh;
}

.gallery img {
  width: 0;
  flex-grow: 1;
  object-fit: cover;
  filter: contrast(50%);
  transition: 0.5s ease;
  
}

.gallery img:hover {
  width: 400px;
  height: 100vh;
  filter: contrast(100%);
  transition: 0.5s ease;
}

@media (max-width: 600px){
  .gallery {
  display: flex;
  width: 100vw;
  height: 400px;
  flex-direction: column;
}

.gallery img {
  width: 100%;
  height: 400px;
  flex-grow: 1;
  object-fit: cover;
}
  .gallery img:hover {
  height: 150%;
  width: 100%;
      
  }
      
  }