CSS Float Grid (one size only)

grid.css

.row,
.row > * {
    box-sizing: border-box;
}
.row::after {
    content: "";
    clear: both;
    display: block;
}
.row .col-1 {width: 8.33%;}
.row .col-2 {width: 16.66%;}
.row .col-3 {width: 25%;}
.row .col-4 {width: 33.33%;}
.row .col-5 {width: 41.66%;}
.row .col-6 {width: 50%;}
.row .col-7 {width: 58.33%;}
.row .col-8 {width: 66.66%;}
.row .col-9 {width: 75%;}
.row .col-10 {width: 83.33%;}
.row .col-11 {width: 91.66%;}
.row .col-12 {width: 100%;}
.row [class*="col-"] {
    float: left;
    padding: 0;
}
img.responsive {
    width: 100%;
    height: auto;
}