.#{$prefix}-scroll-top{
    position: fixed;
    bottom: -70px;
    right: 60px;
    z-index: 2;
    width: 40px;
    height: 40px;
    line-height: 40px;
    font-size: 20px;
    text-align: center;
    border-radius: 100%;
    background-color: $color_black;
    color: $color_white;
    cursor: pointer;
    @include transition();
    &.show{
        bottom: 60px;
    }
}