img {
    width: 100%;
    height: 100%;
}

.grid-sizer {
    width: 8.333vw;
}

.grid-item {
    float: left;
    width: 16.666vw;
    height: 16.666vw;
}

.grid-item--width3 {
    width: 25vw;
}
.grid-item--width4 {
    width: 33.333vw;
}

.grid-item--height3 {
    height: 25vw;
}
.grid-item--height4 {
    height: 33.333vw;
}