How To Add And Use Column Classes In WordPress Theme

/* Column Classes
------------------------------------------------------------ */
 
.five-sixths,
.four-fifths,
.four-sixths,
.one-fifth,
.one-fourth,
.one-half,
.one-sixth,
.one-third,
.three-fifths,
.three-fourths,
.three-sixths,
.two-fifths,
.two-fourths,
.two-sixths,
.two-thirds {
 float: left;
 margin: 0 0 20px;
 padding-left: 3%;
}
 
.one-half,
.three-sixths,
.two-fourths {
 width: 48%;
}
 
.one-third,
.two-sixths {
 width: 31%;
}
 
.four-sixths,
.two-thirds {
 width: 65%;
}
 
.one-fourth {
 width: 22.5%;
}
 
.three-fourths {
 width: 73.5%;
}
 
.one-fifth {
 width: 17.4%;
}
 
.two-fifths {
 width: 37.8%;
}
 
.three-fifths {
 width: 58.2%;
}
 
.four-fifths {
 width: 78.6%;
}
 
.one-sixth {
 width: 14%;
}
 
.five-sixths {
 width: 82%;
}
 
.first {
 clear: both;
 padding-left: 0;
}