wechat-miniprogram-shop-template/pages/usercenter/components/ui-select-picker/index.wxss

.city-picker-container {
  opacity: 0;
  position: fixed;
  top: 100vh;
  left: 0;
  right: 0;
  height: 100vh;
  z-index: 100;
}
.city-picker-container.show {
  top: 0;
  opacity: 1;
}
.city-picker-container.show .city-picker-box {
  bottom: 0;
}
.city-picker-shadow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.65);
}
.city-picker-header {
  height: 100rpx;
  line-height: 100rpx;
  text-align: center;
  font-size: 32rpx;
  color: #333333;
}
.city-picker-more {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.city-picker-footer {
  height: 100rpx;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.city-picker-footer .btn {
  width: 330rpx;
  height: 80rpx;
  line-height: 80rpx;
  text-align: center;
  color: #666666;
  font-size: 32rpx;
  position: relative;
}
.city-picker-footer .btn__active {
  opacity: 0.5;
}
.city-picker-footer .btn::after {
  display: block;
  content: ' ';
  position: absolute;
  left: -50%;
  right: -50%;
  top: -50%;
  bottom: -50%;
  transform: scale(0.5);
  border: 1rpx solid #999999;
  border-radius: 16rpx;
}
.city-picker-footer .btn.primary {
  color: #fa550f;
}
.city-picker-footer .btn.primary::after {
  border-color: #fa550f;
}
.picker-column:not(:first-child) {
  margin-left: 40rpx;
}
.city-picker-box {
  position: absolute;
  bottom: -100%;
  transition: 0.3s bottom ease-in-out;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: #fff;
  padding: 0 30rpx;
  color: #333333;
  font-size: 34rpx;
  border-radius: 20rpx 20rpx 0 0;
  padding-bottom: env(safe-area-inset-bottom);
}
.show .city-picker-shadow {
  display: block;
}
.picker {
  height: 300rpx;
  margin: 50rpx 0;
  line-height: 88rpx;
  text-align: center;
}
/* 似乎小程序picker-view的bug，indicator-class仅height生效，其他诸如line-height、text-align等放到父class中设置 */
.picker-center-row {
  height: 88rpx;
}