.scrollbar(@size:4px,@color:#fafbfc) {
    &::-webkit-scrollbar {
        width: @size;
        height: @size;
    }

    &::-webkit-scrollbar-track,
    &::-webkit-scrollbar-track-piece {
        background-color: @color;
        border-radius: 6px;
    }

    &::-webkit-scrollbar-thumb {
        background-color: @color;
        border-radius: 6px;
    }

    &::-webkit-scrollbar-button,
    &::-webkit-scrollbar-corner,
    &::-webkit-resizer {
        display: none;
    }
}

// 三角
.u-delta {
    .pa;
    background-clip: padding-box;
    background-color: #fff;
    color: @color;
    border: 1px solid rgba(27, 31, 35, 0.15);
    border-radius: 4px;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.1);
    right: -5px;
    list-style: none;
    margin: -6px 0 0 0;
    position: absolute;
    z-index: 820;
    top: 100%;

    &:before {
        content: "";
        display: inline-block;
        position: absolute;
        left: auto;
        right: 14px;
        top: -16px;
        border: 8px solid transparent;
        border-bottom-color: rgba(27, 31, 35, 0.15);
    }

    &:after {
        content: "";
        display: inline-block;
        position: absolute;
        left: auto;
        right: 15px;
        top: -14px;
        border: 7px solid transparent;
        border-bottom-color: #fff;
    }
}