CSS: simple fluid grid system

grid.css

/* @group Columns
------------------------------------------------------------ */

.one-half     { width: 48%; }
.one-third    { width: 30.66%; }
.two-third    { width: 65.33%; }
.one-fourth   { width: 22%; }
.three-fourth { width: 74%; }
.one-fifth    { width: 16.8%; }
.two-fifth    { width: 37.6%; }
.three-fifth  { width: 58.4%; }
.four-fifth   { width: 67.2%; }
.one-sixth    { width: 13.33%; }
.five-sixth   { width: 82.67%; }

.one-half,
.one-third,
.two-third,
.three-fourth,
.one-fourth,
.one-fifth,
.two-fifth,
.three-fifth,
.four-fifth,
.one-sixth,
.five-sixth {
  float: left;
  position: relative;
  margin-right: 4%;
}

.last {
  clear: right;
}

.last {
margin-right: 0 !important;
}

/* @end */