GRID.css

*, *:before, *:after {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

/* Small screens (default) */
/* Elements will default to full width */
html {
  font-size: 100%;
}

.clearfix:before,
.clearfix:after {
  content: " ";
  display: table;
}

.clearfix:after {
  clear: both;
}

.clearfix {
  *zoom: 1;
}

.center {
  text-align: center;
}

/******************************
MEDIA QUERIES
******************************/

/* Medium screens (640px) */
@media (min-width: 40rem) {

  html { font-size: 112%; }

  .column {
    float: left;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .column.full { width: 100%; }
  .column.two-thirds { width: 66.7%; }
  .column.half { width: 50%; }
  .column.third { width: 33.3%; }
  .column.fourth { width: 24.95%; }
  .column.three-fourths { width: 74.95%; }
  .column.flow-opposite { float: right; }
}

/* Large screens (1024px) */
@media (min-width: 64rem) {
  html { font-size: 120%; }
}