main {
  grid-column: col-start 2 / span 11;
}

#forum {
  display: grid;
  font-family : 'ヒラギノ明朝 ProN' , 'Hiragino Mincho ProN' , '游明朝','游明朝体',YuMincho,'Yu Mincho' , 'ＭＳ 明朝' , 'MS Mincho' , HiraMinProN-W3 , 'TakaoEx明朝' , TakaoExMincho , 'MotoyaLCedar' , 'Droid Sans Japanese' , serif;
  grid-template-columns: repeat(12, [col-start] 1fr);
  grid-gap: 20px;
  grid-auto-rows: minmax(24px, auto);
}

body {
  background-color: whitesmoke;
}