.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}

.flex-1 {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

/*垂直排列*/
.flex-v {
  -webkit-box-orient: vertical;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
}

/*水平排列(默认)*/
.flex-p {
  -webkit-box-orient: horizontal;
  -webkit-flex-direction: row;
  -ms-flex-direction: row;
  flex-direction: row;
}

/**水平排列，起点在右端。**/
.flex-direction {
  flex-direction: row-reverse;
}

/*默认值。元素被拉伸以适应容器*/
.flex-align-start {
  -webkit-box-align: start;
  -webkit-align-items: flex-start;
  -ms-flex-align: start;
  align-items: start;
}

/*垂直居中对齐*/
.flex-align-center {
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}

/*垂直同高*/
.flex-stretch {
  -webkit-box-align: stretch;
  -webkit-align-items: stretch;
  -ms-flex-align: stretch;
  align-items: stretch;
}

/*元素位于容器的结尾*/
.flex-align-end {
  -webkit-box-align: end;
  -webkit-align-items: flex-end;
  -ms-flex-align: end;
  align-items: flex-end;
}

/*水平居中对齐*/
.flex-pack-center {
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
}

/*项目位于容器的结尾*/
.flex-pack-end {
  -webkit-box-pack: end;
  -webkit-justify-content: flex-end;
  -ms-flex-pack: end;
  justify-content: flex-end;
}

/*水平两端对齐(元素合理排列)-项目位于各行之间留有空白的容器内*/
.flex-pack-justify {
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  -ms-flex-pack: justify;
  justify-content: space-between;
}

/*水平相同间隔对齐-项目位于各行之前、之间、之后都留有空白的容器内*/
.flex-pack-around {
  -webkit-box-pack: justify;
  -webkit-justify-content: space-around;
  -ms-flex-pack: justify;
  justify-content: space-around;
}

/*规定灵活的项目在必要的时候拆行或拆列*/
.flex-wrap {
  flex-wrap: wrap;
  -webkit-flex-wrap: wrap;
}

/*垂直居中对齐+水平居中对齐*/
.flex-center {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
}