iview/styles/components/tooltip.less

@tooltip-prefix-cls: ~"@{css-prefix}tooltip";
@tooltip-arrow: ~"@{tooltip-prefix-cls}-arrow";
@tooltip-max-width: 250px;
@tooltip-arrow-width: 5px;
@tooltip-distance: @tooltip-arrow-width - 1 + 4;

.@{tooltip-prefix-cls} {
    display: inline-block;

    &-rel{
        display: inline-block;
        position: relative;
    }

    &-popper{
        .popper(@tooltip-arrow, @tooltip-arrow-width, @tooltip-distance, @tooltip-bg);
    }

    &-inner{
        max-width: @tooltip-max-width;
        min-height: 34px;
        padding: 8px 10px;
        color: @tooltip-color;
        text-align: left;
        text-decoration: none;
        background-color: @tooltip-bg;
        border-radius: @border-radius-small;
        box-shadow: @shadow-base;
        white-space:nowrap;
    }

    &-arrow{
        position: absolute;
        width: 0;
        height: 0;
        border-color: transparent;
        border-style: solid;
    }
}