nutui/miniprogram_dev/components/packages/popup/index.wxss

.nut-popup-slide-center-enter-active, .nut-popup-slide-center-leave-active {
  transition-property: opacity;
  transition-timing-function: ease;
}
.nut-popup-slide-center-enter-from, .nut-popup-slide-center-leave-to {
  opacity: 0;
}
.nut-popup-slide-top-enter-from, .nut-popup-slide-top-leave-active {
  transform: translate(0, -100%);
}
.nut-popup-slide-right-enter-from, .nut-popup-slide-right-leave-active {
  transform: translate(100%, 0);
}
.nut-popup-slide-bottom-enter-from, .nut-popup-slide-bottom-leave-active {
  transform: translate(0, 100%);
}
.nut-popup-slide-left-enter-from, .nut-popup-slide-left-leave-active {
  transform: translate(-100%, 0);
}

.nut-popup--center {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.nut-popup--center.round {
  border-radius: 20px;
}

.nut-popup--bottom {
  bottom: 0;
  left: 0;
  width: 100%;
}
.nut-popup--bottom.round {
  border-radius: 20px 20px 0 0;
}
.nut-popup--bottom--safebottom {
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
}

.nut-popup--right {
  top: 0;
  right: 0;
}
.nut-popup--right.round {
  border-radius: 20px 0 0 20px;
}

.nut-popup--left {
  top: 0;
  left: 0;
}
.nut-popup--left.round {
  border-radius: 0 20px 20px 0;
}

.nut-popup--top {
  top: 0;
  left: 0;
  width: 100%;
}
.nut-popup--top.round {
  border-radius: 0 0 20px 20px;
}

.nut-popup {
  position: fixed;
  max-height: 100%;
  overflow-y: auto;
  background-color: #fff;
  -webkit-overflow-scrolling: touch;
}
.nut-popup__close-icon {
  position: absolute !important;
  z-index: 1;
  color: #969799;
  font-size: 18px;
  cursor: pointer;
  width: 30px;
  height: 30px;
  line-height: 30px;
  text-align: center;
}
.nut-popup__close-icon:active {
  opacity: 0.7;
}
.nut-popup__close-icon--top-left {
  top: 16px;
  left: 16px;
}
.nut-popup__close-icon--top-right {
  top: 16px;
  right: 16px;
}
.nut-popup__close-icon--bottom-left {
  bottom: 16px;
  left: 16px;
}
.nut-popup__close-icon--bottom-right {
  right: 16px;
  bottom: 16px;
}