@import url(https://fonts.googleapis.com/css?family=Montserrat:500);

:root {
  /* Base font size */
  font-size: 10px;
}

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

.gallery {
  display: flex;
  flex-wrap: wrap;
  /* Compensate for excess margin on outer gallery flex items */
  margin: -1rem -1rem;
}

.gallery-item {
  /* Minimum width of 24rem and grow to fit available space */
  flex: 1 0 24rem;
  /* Margin value should be half of grid-gap value as margins on flex items don't collapse */
  margin: 1rem;
  box-shadow: 0.3rem 0.4rem 0.4rem rgba(0, 0, 0, 0.4);
  overflow: hidden;
}

.gallery-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease-out;
}

.gallery-image:hover {
  transform: scale(1.15);
}

/*

The following rule will only run if your browser supports CSS grid.

Remove or comment-out the code block below to see how the browser will fall-back to flexbox styling. 

*/

@supports (display: grid) {
  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr));
    grid-gap: 2rem;
  }

  .gallery,
  .gallery-item {
    margin: 0;
  }
}