amis/packages/amis-ui/scss/components/_modal.scss

.is-modalOpened {
  overflow: hidden;

  .#{$ns}Modal {
    overflow-x: hidden;
    overflow-y: auto;
  }
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translate3d(0, -300px, 0) scale(0.2);
  }
}

@keyframes modalOut {
  to {
    opacity: 0;
    transform: translate3d(0, -300px, 0) scale(0.2);
  }
}

.#{$ns}Modal {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: $zindex-modal;
  overflow: hidden;
  outline: 0;

  &-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%; // Ensure `.modal-content` extends the full width of the parent `.modal-dialog`
    pointer-events: auto;
    background: var(--Modal-bg);
    background-clip: padding-box;
    outline: 0;
    z-index: 2;
    margin-left: auto;
    margin-right: auto;
    margin-top: var(--Modal-content-startMarginTop);
    margin-bottom: var(--gap-md);
    padding: var(--dialog-default-padding-y) var(--Modal-body-paddingX);
    border: var(--Modal-content-borderWidth) solid
      var(--Modal-content-borderColor);
    border-radius: var(--dialog-default-border-radius);

    &.in,
    &.out {
      animation-duration: var(--animation-duration);
      animation-fill-mode: both;
    }

    &.in {
      animation-name: modalIn;
    }

    &.out {
      animation-name: modalOut;
    }
  }

  &-overlay {
    transition: ease-in-out opacity var(--animation-duration);
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;
    background: var(--Modal-overlay-bg);
    pointer-events: none; // 很重要，如果不设置，弹框虽然滚轮可滚，但是鼠标没办法操作滚动条。
    opacity: 0;

    &.in {
      opacity: 1;
    }

    &.out {
      opacity: 0;
    }
  }

  &-header {
    padding: var(--Modal-header-paddingY) #{px2rem(24px)};
    background: var(--Modal-header-bg);
    @include clearfix();
    border-bottom: var(--Modal-body-borderTop);
    border-top-left-radius: var(--Modal-content-borderRadius);
    border-top-right-radius: var(--Modal-content-borderRadius);
  }

  &-title {
    font-size: var(--dialog-header-fontSize);
    color: var(--dialog-header-color);
    font-weight: var(--dialog-header-fontWeight);
    height: var(--dialog-header-height);
  }

  &-close {
    float: right;
    color: var(--Modal-close-color);
    line-height: inherit;
    text-decoration: none;
    vertical-align: middle;
    z-index: calc(#{$zindex-spinner-overlay} + 1);

    .Dialog-close {
      content: var(--dialog-icon-icon);
    }

    svg {
      width: var(--dialog-icon-size);
      height: var(--dialog-icon-size);
      fill: var(--Modal-close-color);
      color: var(--dialog-icon-color);
    }

    &:not(.is-disabled) {
      cursor: pointer;

      &:hover {
        text-decoration: none;
        color: var(--Model-close-onHover-color);

        svg {
          fill: var(--Model-close-onHover-color);
        }
      }
    }
  }

  &-content > &-close {
    position: absolute;
    right: var(--gap-md);
    top: var(--gap-sm);
    z-index: 10;
  }

  &-body {
    margin: #{px2rem(16px)} 0 #{px2rem(24px)} 0;
    flex-grow: 1;
    height: auto;
    // overflow-y: auto;
    padding: 0 #{px2rem(24px)};
    font-size: var(--dialog-content-fontSize);
    color: var(--dialog-content-color);
  }

  &-footer {
    // @include clearfix();

    height: var(--dialog-footer-height);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: var(--Modal-footer-padding) #{px2rem(24px)};
    border-top: var(--Modal-body-borderBottom);
    margin: var(--Modal-footer-marginY) var(--Modal-footer-marginX);
    border-bottom-left-radius: var(--Modal-content-borderRadius);
    border-bottom-right-radius: var(--Modal-content-borderRadius);

    .#{$ns}Button {
      min-width: var(--Modal-footer-button-width);
      margin-left: var(--dialog-footer-margin-left);
    }
  }
}

@for $i from (2) through 10 {
  .#{$ns}Modal--#{$i}th {
    .#{$ns}Modal-content {
      margin-top: calc(
        var(--Modal-content-startMarginTop) +
          #{($i - 1)} *
          var(--Modal-content-stepMarginTop)
      );
    }
  }
}

@include media-breakpoint-up(sm) {
  .#{$ns}Modal-content:not(.#{$ns}Modal-content-custom) {
    max-width: var(--dialog-size-normal-width);
    border-width: var(--dialog-default-border-width);
  }

  .#{$ns}Modal--sm .#{$ns}Modal-content {
    max-width: var(--dialog-size-sm-width);
  }

  .#{$ns}Modal--base .#{$ns}Modal-content {
    max-width: var(--Modal-widthBase);
  }

  .#{$ns}Modal--md .#{$ns}Modal-content {
    max-width: var(--Modal-widthMd);
  }

  .#{$ns}Modal--lg .#{$ns}Modal-content {
    max-width: var(--dialog-size-lg-width);
  }

  .#{$ns}Modal--xl .#{$ns}Modal-content {
    max-width: var(--dialog-size-xl-width);
  }
}

.#{$ns}Dialog-info {
  flex-basis: 0;
  flex-grow: 1;
  text-align: left;
}

.#{$ns}Dialog-error {
  color: var(--danger);
  white-space: pre-wrap;
}

.#{$ns}Modal--full {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  > .#{$ns}Modal-content {
    flex-basis: 0;
    flex-grow: 1;
    margin: 30px;
    width: calc(100% - 60px);
    max-width: unset;

    > .#{$ns}Modal-body {
      height: 0;
      overflow: auto;
    }
  }
}

/* 移动端样式调整 */
@include media-breakpoint-down(sm) {
  .#{$ns}Modal {
    .#{$ns}Modal-footer {
      display: flex;

      > .#{$ns}Button {
        flex: 1;
        height: px2rem(44px);

        &:first-child {
          margin-left: 0;
        }
      }
    }
  }
}