* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

body {
  font-family: sans-serif;
}

.container {
  background: #EEE;
  width: 180px;
  margin-bottom: 20px;
  position: relative;
}

.item {
  width:  60px;
  height: 30px;
  float: left;
  border: 1px solid;
  background: #09F;
}

.item.w2 { width: 120px; }
.item.w3 { width: 180px; }

.item.h2 { height:  50px; }
.item.h3 { height:  70px; }
.item.h4 { height:  90px; }
.item.h5 { height: 110px; }

.stamp {
  background: red;
  opacity: 0.75;
  position: absolute;
  border: 1px solid;
}


/* ---- gutter ---- */

#gutter {
  width: 220px;
}

#gutter .item.w2 { width: 140px; }

/* ---- stamp ---- */

.has-stamp .item { width: 45px; }

/* stout, in the middle */
.has-stamp .stamp1 {
  width: 40px;
  height: 30px;
}

/* really wide */
.has-stamp .stamp2 {
  width: 200px;
  height: 20px;
}

#stamp-top-left .stamp1 {
  left: 70px;
  top: 10px;
}

#stamp-top-left .stamp2 {
  left: -5px;
  top: 0;
}

#stamp-column-width-multiple .stamp1 {
  width: 90px;
  left: 45px;
  top: 0;
}

#stamp-bottom-right .stamp1 {
  right: 70px;
  bottom: 10px;
}

#stamp-bottom-right .stamp2 {
  right: -5px;
  bottom: 0;
}

/* ---- fit width ---- */

#fit-width {
  width: 160px;
  background: #CCC;
}

#fit-width .container {
  margin: 0 auto;
}

/* ----  ---- */

#zero-column-width .hidden {
  display: none;
}

/* ---- element-sizing ---- */

#element-sizing {
  width: 181px;
}

#element-sizing .item,
#element-sizing .grid-sizer { width: 20%; }

#element-sizing .item.w2 { width: 40%; }

/* ---- pixel-rounding ---- */

#pixel-rounding {
  width: 170px;
}

#pixel-rounding .item { width: 28.667%; }
#pixel-rounding .gutter-sizer { width: 7%; }