* {
  box-sizing: border-box;
}

.grid:after {
  content: '';
  display: block;
  clear: both;
}

.grid-sizer,
.grid-item {
  width: 33.333%;
  padding: 5px;
}
@media (max-width: 575px) {
  .grid-sizer,
  .grid-item {
    width: 100%;
  }
}
@media (min-width: 576px) and (max-width: 767px) {
  .grid-sizer,
  .grid-item {
    width: 50%;
  }
}

/* To change the amount of columns on larger devices, uncomment the code below */

@media (min-width: 768px) and (max-width: 991px) {
  .grid-sizer,
  .grid-item {
    width: 33.333%;
  }
}
@media (min-width: 992px) and (max-width: 1199px) {
  .grid-sizer,
  .grid-item {
    width: 25%;
  }
}
@media (min-width: 1200px) {
  .grid-sizer,
  .grid-item {
    width: 20%;
  }
}

.grid-item {
  float: left;
}

.grid-item img {
  display: block;
  max-width: 100%;
}