.box150150 {
height: 150px;
width: 150px;
background-color: #aaaaaa;
display: inline-block;
//border-radius: 0px;
border: 1px solid red;
border: 0px
margin: 0px;
padding: 0px;
text-align: center;
}

.row
{
/* Between the blocks there is a small gap.
// used: https://css-tricks.com/fighting-the-space-between-inline-block-elements
// https://codepen.io/chriscoyier/pen/hmlqF */
display: flex;
//height: 150px;
border-radius: 0px;
margin: 0px 0px;
padding: 0px 0px;
border: 0px
//border: 1px solid green;
}