body{
  margin: 0;
  background-color: rgb(255, 255, 255);
}
.gallery{
  margin: 0 1em;
  position: relative;
}
.slider{
  display: grid;
  grid-auto-columns: 45vh;
  grid-template-rows: 90vh;
  grid-auto-flow: column;
  overflow-x: auto;
  overflow-y: hidden;
  grid-gap: 0 1em;
  padding: 1em 0;
  scrollbar-color: rgb(0, 0, 0) rgb(230, 230, 230);
}

.slider img{
  position: relative;
  object-fit: cover;
  width: 100%;
  height: 100%;
  transition: 0.2s transform;
  box-shadow: 0 0 0.2em rgba(0, 0, 0, 0.3);
}

.gallery .controls .control{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  background-color: rgba(0, 0, 0, 0.3);
  padding: 10% 2em;
  color: rgb(255, 255, 255);
  border: none;
  box-shadow: 0 0 0.3em rgba(0, 0, 0, 0.3);
  cursor: pointer;
  transition: 0.2s box-shadow, 0.2s background-color;
}
.gallery .controls .control:hover{
  box-shadow: 0 0 0.5em rgba(0, 0, 0, 0.5);
  background-color: rgba(0, 0, 0, 0.5);
}
.gallery .controls .control:focus{
  box-shadow: none;
  background-color: rgba(0, 0, 0, 0.5);
  outline: 1px solid rgb(255, 255, 255);
}
.gallery .controls .control:active{
  box-shadow: none;
  outline: 1px solid rgb(255, 255, 255);
  background-color: rgba(255, 255, 255, 0.3);
}
.gallery .controls .control.right{
  right: 0;
}

@media (min-width: 35em){
  body{
    background-color: rgb(0, 0, 0);
  }
  .slider{
    scrollbar-color: rgb(230, 230, 230) rgb(50, 50, 50);
  }
  .slider img{
    box-shadow: none;
  }
  .slider img:hover{
    transform: scale(1.2);
    z-index: 1;
  }
  .gallery .controls .control{
    opacity: 0;
    transition: 0.2s opacity;
  }
  .gallery:hover .controls .control{
    opacity: 1;
  }
}