mor-backtop{
    display: inline-block;
    height: @fontSize*2.5;
    line-height: @fontSize*2.5;
    text-align: center;
    background-color: darken(@colorComponentItemBg, 8%);
    cursor: pointer;
    transition: background-color 0.2s, opacity 0.2s;
    color: darken(@colorComponentItemFont, 20%);
    font-size: @fontSize*0.875;
    padding: 0 1em;
    opacity: 0;
    pointer-events: none;

    > i,
    > .mo-icon,
    > .iconfont{
        color: @colorComponentItemFont;
    }

    &.show{
        opacity: 1;
        pointer-events: auto;
    }

    &:hover{
        background-color: darken(@colorComponentItemBgHover, 15%);
        color: @colorBlack;

        > i,
        > .mo-icon,
        > .iconfont{
            color: @colorBlack;
        }
    }

    &.fixed{
        position: fixed;
        bottom: @fontSize*2.5;
        right: @fontSize*2.5;
        z-index: 1;
    }

    // default status
    &{}
}