.row {
   display: block;
   width: 100%;
   background: #ddd;
}
.col-1, .col-2, .col-3, .col-4 {
   display: inline-block;
   height: 100px;
}
.col-1 {
   width: 24.7%;
   background: red;
}
.col-2 {
   width: 49.7%;
   background: green;
}
.col-3 {
   width: 74.7%;
   background: blue;
}
.col-4 {
   width: 99.5%;
   background: pink;
}