amis2/scss/components/_dropdown.scss

.#{$ns}DropDown {
    position: relative;
    display: inline-block;

    &-caret {
        margin-left: $DropDown-caret-marginLeft;
    }

    &--block {
        display: block;

        .#{$ns}Button {
            display: block;
        }
    }

    &-menu {
        position: absolute;
        z-index: $zindex-dropdown;
        top: 100%;
        left: 0;
        margin: px2rem(1px) 0 0;
        background-color: $DropDown-menu-bg;
        list-style: none;
        padding: $DropDown-menu-paddingY $DropDown-menu-paddingX;
        border: $DropDown-menu-borderWidth solid $DropDown-menu-borderColor;
        border-radius: $DropDown-menu-borderRadius;
        box-shadow: $DropDown-menu-boxShadow;
        min-width: $DropDown-menu-minWidth;
        text-align: left;
    }

    &--alignRight &-menu {
        left: auto;
        right: 0;
    }

    &-menuItem,
    &-menu > li {
        padding: $DropDown-menuItem-paddingY $DropDown-menuItem-paddingX;
        white-space: nowrap;
        box-sizing: border-box;
        height: $DropDown-menu-height;
        vertical-align: middle;
        user-select: none;

        &:hover {
            background-color: $DropDown-menuItem-onHover-bg;
            color: $DropDown-menuItem-onHover-color;
        }

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

        &.#{$ns}DropDown-divider {
            height: px2rem(1px);
            margin: px2rem(9px) 0;
            overflow: hidden;
            background-color: $DropDown-menu-borderColor;
            padding: 0;
        }
    }

    &-menu > li a {
        display: block;
        text-decoration: none;
    }

    &-popover {
        border: none;
        box-shadow: none;
    }
}