.grid{
    width: 40vmin;
    height: 80vmin;
    background-color: deepskyblue;
    display: flex;
    flex-wrap: wrap;
    
}
.grid div{
    width: 4vmin;
    height: 4vmin;
    background-color: azure;
    /*box-shadow: inset 0.4vmin 0.4vmin grey;*/
    
}