amis2/scss/components/_popover.scss

.#{$ns}PopOver {
    position: absolute;
    background: $PopOver-bg;
    top: 0;
    left: 0;
    z-index: $zindex-popover;
    display: none;
    padding: 0;
    margin: 0;
    font-weight: $fontWeightNormal;
    letter-spacing: normal;
    line-height: $lineHeightBase;
    text-align: left;
    text-align: start;
    text-decoration: none;
    text-shadow: none;
    text-transform: none;
    white-space: normal;
    word-break: normal;
    word-spacing: normal;
    word-wrap: normal;
    font-size: $fontSizeBase;
    box-shadow: $boxShadow;
    border: $borderWidth solid $borderColor;
    border-radius: $borderRadius;

    &-overlay {
        position: fixed !important;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1;
        bottom: 0;
        background: transparent;

        & + * {
            position: relative;
            z-index: 2;
        }
    }
}