[class*="col-"] {
  padding: 10px;
}
 
@media all and ( min-width: 600px ) {
 
  .col-2-3 {
    float: left;
    width: 66.66%;
  }
  .col-1-2 {
    float: left;
    width: 50%;
  }
  .col-1-3 {
    float: left;
    width: 33.33%;
  }
  .col-1-4 {
    float: left;
    width: 25%;
  }
  .col-1-8 {
    float: left;
    width: 12.5%;
  }
 
}

@media all and ( min-width: 600px ) {
 
  .col-1-8 {
    float: left;
    width: 25%;
  }
  .col-1-8:nth-child(4n+1) {
    clear: both;
  }
 
}
 
@media all and ( min-width: 960px ) {
 
  .col-1-8 {
    width: 12.5%;
  }
  .col-1-8:nth-child(4n+1) {
    clear: none;
  }
 
}