.inner { max-width:990px; margin:0 auto;}
.single-column {/*background:#ccc*/; height:100%; overflow:auto}
.single-column .column {width: 100%;}
.two-columns  {/*background:#ddd;*/ height:100%; overflow:auto}
.two-columns .column { float:left}
.two-columns .column:first-child {width:66.6666666%;}
.three-columns {/*background:#eee;*/ height:100%; overflow:auto}
.three-columns .column { float:left}
.column {width:33.3333333%; }
main { height:100%; overflow:visible} 
footer { clear:both}
.column section { margin: 2em 1em 1em 1em; padding:0 1em 1em 1em; /*background: rgba(0,0,0,0.2)*/}