/* 父元素-flex容器 */
.flex {
  display: flex;
  display: -moz-box;
  /* Firefox 17- */
  display: -webkit-flex;
  /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
  display: -moz-flex;
  /* Firefox 18+ */
  display: -ms-flexbox;
  /* IE 10 */
}

/* 父元素-纵向排列（主轴） */
.flex-column {
  -webkit-box-orient: vertical;
  flex-direction: column;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  -moz-flex-direction: column;
  -o-flex-direction: column;
}

/* 子元素-平均分栏 */
.flex1 {
  -webkit-flex: 1;
  /* Chrome */
  -ms-flex: 1;
  /* IE 10 */
  flex: 1;
  /* NEW, Spec - Opera 12.1, Firefox 20+ */
  -webkit-box-flex: 1;
  /* OLD - iOS 6-, Safari 3.1-6 */
  -moz-box-flex: 1;
  /* OLD - Firefox 19- */
}

/* 父元素-横向换行 */
.flex-wrap {
  -webkit-flex-wrap: wrap;
  -moz-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  -o-flex-wrap: wrap;
  flex-wrap: wrap;
}

/* 父元素-竖直居中（主轴是横向才生效） */
.align-center {
  -webkit-box-align: center;
  -moz-align-items: center;
  -ms-align-items: center;
  -o-align-items: center;
  -webkit-align-items: center;
  align-items: center;
}

.align-start {
  -webkit-box-align: start;
  -moz-align-items: flex-start;
  -ms-align-items: flex-start;
  -o-align-items: flex-start;
  -webkit-align-items: flex-start;
  align-items: flex-start;
}

.align-end {
  -webkit-box-align: end;
  -moz-align-items: flex-end;
  -ms-align-items: flex-end;
  -o-align-items: flex-end;
  -webkit-align-items: flex-end;
  align-items: flex-end;
}

/* 父元素-水平居中（主轴是横向才生效） */
.justify-center {
  -webkit-box-pack: center;
  -ms-justify-content: center;
  -moz-justify-content: center;
  -o-justify-content: center;
  -webkit-justify-content: center;
  justify-content: center;
}

.justify-between {
  -webkit-box-pack: justify;
  -ms-justify-content: space-between;
  -moz-justify-content: space-between;
  -o-justify-content: space-between;
  -webkit-justify-content: space-between;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}

.justify-around {
  -webkit-box-pack: justify;
  -ms-justify-content: space-around;
  -moz-justify-content: space-around;
  -o-justify-content: space-around;
  -webkit-justify-content: space-around;
  -webkit-justify-content: space-around;
  justify-content: space-around;
}

.justify-end {
  -webkit-box-pack: end;
  -ms-justify-content: flex-end;
  -moz-justify-content: flex-end;
  -o-justify-content: flex-end;
  -webkit-justify-content: flex-end;
  -webkit-justify-content: flex-end;
  justify-content: flex-end;
}