.row{
    /* background-color: lightsalmon; */
    margin: 0 auto 15px;
    width: 340px;
    box-sizing: border-box;
}

.row:after {
  content: '';
  display: table;
  clear: both;
}

.col{
  background-color: lightgoldenrodyellow;
  border: 2px dashed lightpink;
  padding: 15px;
  margin-left: 15px;
  float: left;
}

.col:first-child{
  margin-left: 0;
}