/**
 * author ctj -- 自定义公用样式
 */
/*清除浮动*/
.clearfix:after {
  height: 0;
  content: '';
  display: block;
  clear: both;
}
.clearfix { /*兼容 IE*/
  zoom: 1;
}

/*布局*/
//水平对齐
.flexh {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

//垂直对齐
.flexv {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
}

//不扩展自身
.flex0 {
  -webkit-box-flex: 0;
  -ms-flex: none;
  flex: none;
}
// 尽可能占空余空间
.flex1 {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

// 两端向中间对齐
.flex-between {
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
}

// 中间向两端对齐
.flex-around {
  -ms-flex-pack: distribute;
  justify-content: space-around;
}
// 垂直排序
.flex-vstart {
  align-items: flex-start
}
// 水平排序
.flex-hstart {
  justify-content: flex-start
}

// 多列 水平居中对齐
.flex-vcenter {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

// 多行垂直居中对齐
.flex-hcenter {
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
}
// 垂直倒序
.flex-vend {
  -webkit-box-align: end;
  -ms-flex-align: end;
  align-items: flex-end;
}
// 水平倒序
.flex-hend {
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  justify-content: flex-end;
}
// 自身重定对齐
.flex-self-start {
  -ms-flex-item-align: start;
  align-self: flex-start;
}
.flex-self-center {
  align-self: center;
}
.flex-self-end {
  -ms-flex-item-align: end;
  align-self: flex-end;
}

/*flex换行*/
.flex-wrap {
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

/*手形鼠标*/
.cur-pointer {
  cursor: pointer;
}

/*阴影*/
.box-shadow {
  -webkit-box-shadow: 0 0 13px -5px #000;
  box-shadow: 0 0 13px -5px #000;
}
// 文本处理
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-nowrap { white-space: nowrap; }
.over-hide { overflow: hidden; }
/*文本换行*/
.break-all { word-break: break-all; }
/*文本pre显示*/
.content-pro { white-space: pre-wrap; }
/*省略号*/
.ellipsis {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/*美化滚动条*/
.scrollbar {
  &::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }
  &::-webkit-scrollbar-track {
    background-color: transparent;
    border-radius: 4px;
  }
  &::-webkit-scrollbar-thumb {
    border-radius: 4px;
    background-color: #ddd;
  }
  &::-webkit-scrollbar-button {
    display: block;
    width: 1px;
    height: 1px;
  }
  &.auto-hide::-webkit-scrollbar-thumb {
    border-radius: 4px;
    background-color: transparent;
  }

  &.auto-hide {
    &:hover::-webkit-scrollbar-thumb {
      background-color: #c3c3c3;
    }
    &:hover::-webkit-scrollbar {
      width: 8px;
      height: 8px;
    }
  }
}
// 颜色class
.color-link { color: #459AE9; }
.color-grey { color: #8B97A4; }
.color-green { color: #4ee49b; }

<style></style>

学习自Flex布局 http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html