body{
  margin:0;
  padding:0;
  background:#fff;
}

.infinite{
  max-width:900px;
  width:100%;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  padding:50px;
  margin:0 auto;
}

.infinite div{
  background: #f1f1f1;
  flex:0 0 30%;
  height:400px;
  margin-bottom:50px;
}