.main {
  overflow: hidden;
  padding: 0 100px;
  margin-top: 80px;
}

.article {
  float: left;
  width: 900px;
  background: #fff;
  padding: 50px;
  box-sizing: border-box;
}

.time {
  margin-top: 10px;
}

.content {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
}

@media (max-width: 768px) {
  .main {
    padding: 0;
    margin-top: 40px;
  }

  .article {
    padding: 20px;
    width: auto;
  }
}