responsive css on 12 col based

responsive.css

.row {    
  display: block;    
  padding-right: 35px;
  padding-left: 35px;
  clear:both;
}
/* For mobile phones: */
[class*="col-"] {
  width: 100%;
}
@media only screen and (min-width: 600px) {
  /* For tablets: */
  [class*="col-"] {float: left;}
  .col-x-1 {width: 8.33%;}
  .col-x-2 {width: 16.66%;}
  .col-x-3 {width: 25%;}
  .col-x-4 {width: 33.33%;}
  .col-x-5 {width: 41.66%;}
  .col-x-6 {width: 50%;}
  .col-x-7 {width: 58.33%;}
  .col-x-8 {width: 66.66%;}
  .col-x-9 {width: 75%;}
  .col-x-10 {width: 83.33%;}
  .col-x-11 {width: 91.66%;}
  .col-x-12 {width: 100%;}
  .col-offset-x-1 {margin-left: 8.33%;}
  .col-offset-x-2 {margin-left: 16.66%;}
  .col-offset-x-3 {margin-left: 25%;}
  .col-offset-x-4 {margin-left: 33.33%;}
  .col-offset-x-5 {margin-left: 41.66%;}
  .col-offset-x-6 {margin-left: 50%;}
  .col-offset-x-7 {margin-left: 58.33%;}
  .col-offset-x-8 {margin-left: 66.66%;}
  .col-offset-x-9 {margin-left: 75%;}
  .col-offset-x-10 {margin-left: 83.33%;}
  .col-offset-x-11 {margin-left: 91.66%;}
  .col-offset-x-12 {margin-left: 100%;}
}
@media only screen and (min-width: 768px) {
  /* For mini desktop: */
  [class*="col-"] {float: left;}
  .col-m-1 {width: 8.33%;}
  .col-m-2 {width: 16.66%;}
  .col-m-3 {width: 25%;}
  .col-m-4 {width: 33.33%;}
  .col-m-5 {width: 41.66%;}
  .col-m-6 {width: 50%;}
  .col-m-7 {width: 58.33%;}
  .col-m-8 {width: 66.66%;}
  .col-m-9 {width: 75%;}
  .col-m-10 {width: 83.33%;}
  .col-m-11 {width: 91.66%;}
  .col-m-12 {width: 100%;}
  .col-offset-m-1 {margin-left: 8.33%;}
  .col-offset-m-2 {margin-left: 16.66%;}
  .col-offset-m-3 {margin-left: 25%;}
  .col-offset-m-4 {margin-left: 33.33%;}
  .col-offset-m-5 {margin-left: 41.66%;}
  .col-offset-m-6 {margin-left: 50%;}
  .col-offset-m-7 {margin-left: 58.33%;}
  .col-offset-m-8 {margin-left: 66.66%;}
  .col-offset-m-9 {margin-left: 75%;}
  .col-offset-m-10 {margin-left: 83.33%;}
  .col-offset-m-11 {margin-left: 91.66%;}
  .col-offset-m-12 {margin-left: 100%;}
}
@media only screen and (min-width: 980px) {
  /* For desktop: */
  [class*="col-"] {float: left;}
  .col-1 {width: 8.33%;}
  .col-2 {width: 16.66%;}
  .col-3 {width: 25%;}
  .col-4 {width: 33.33%;}
  .col-5 {width: 41.66%;}
  .col-6 {width: 50%;}
  .col-7 {width: 58.33%;}
  .col-8 {width: 66.66%;}
  .col-9 {width: 75%;}
  .col-10 {width: 83.33%;}
  .col-11 {width: 91.66%;}
  .col-12 {width: 100%;}
  .col-offset-1 {margin-left: 8.33%;}
  .col-offset-2 {margin-left: 16.66%;}
  .col-offset-3 {margin-left: 25%;}
  .col-offset-4 {margin-left: 33.33%;}
  .col-offset-5 {margin-left: 41.66%;}
  .col-offset-6 {margin-left: 50%;}
  .col-offset-7 {margin-left: 58.33%;}
  .col-offset-8 {margin-left: 66.66%;}
  .col-offset-9 {margin-left: 75%;}
  .col-offset-10 {margin-left: 83.33%;}
  .col-offset-11 {margin-left: 91.66%;}
  .col-offset-12 {margin-left: 100%;}
}