/* 公共样式 */
/* 盒子模型布局 */
._df {
  display: flex;
}
._df._fr {
  flex-flow: row nowrap;
}
._df._frw {
  flex-flow: row wrap;
}
._df._fc {
  flex-flow: column nowrap;
}
._df._fcw {
  flex-flow: column wrap;
}
._df._ac {
  align-items: center;
}
._df.acc {
  align-content: center;
}
._df.justify-center {
  justify-content: center;
}
._df.justify-left {
  justify-content: flex-start;
}
._df.justify-right {
  justify-content: flex-end;
}
._df.justify-around {
  justify-content: space-around;
}
._df.justify-between {
  justify-content: space-between;
}