.weui-mask {
    position: fixed;
    z-index: 1000;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
  }
  
  .weui-animate-fade-in {
    -webkit-animation: fadeIn ease .3s forwards;
    animation: fadeIn ease .3s forwards;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
  
  .weui-picker {
    position: fixed;
    width: 100%;
    max-width: 640px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5000;
    margin: 0 auto;
    background-color: #fff;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transform: translate(0, 100%);
    transform: translate(0, 100%);
    -webkit-transition: -webkit-transform .3s;
    transition: -webkit-transform .3s;
    transition: transform .3s;
  }
  
  @keyframes slideUp {
    from {
      transform: translate3d(0, 100%, 0);
    }
  
    to {
      transform: translate3d(0, 0, 0);
    }
  }
  
  .weui-animate-slide-up {
    animation: slideUp ease .3s forwards;
  }
  
  .weui-picker__hd {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    padding: 16px;
    position: relative;
    text-align: center;
    font-size: 17px;
    line-height: 1.4;
  
    .weui-picker__action {
      display: block;
      -webkit-box-flex: 1;
      -webkit-flex: 1;
      flex: 1;
      color: #108ee9;
    }
  
    .weui-picker__action:last-child {
      text-align: right;
    }
  }
  
  .weui-picker__hd:after {
    content: " ";
    position: absolute;
    left: 0;
    bottom: 0;
    right: 0;
    height: 1px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    color: rgba(0, 0, 0, 0.1);
    -webkit-transform-origin: 0 100%;
    transform-origin: 0 100%;
    -webkit-transform: scaleY(0.5);
    transform: scaleY(0.5);
  }
  
  .weui-picker__bd {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    position: relative;
    background-color: #fff;
    height: 240px;
    overflow: auto;
    .weui-picker__content {
      width: 100%;
      padding-bottom: 90px;
      height: auto;
      overflow-y: scroll;
      -webkit-overflow-scrolling: touch;
      .weui-picker__item {
        height: 50px;
        line-height: 50px;
        padding: 0 15px;
      }
    }
  }
  
  