@mixin board-background-color {
    &.theme-colorful .board-host-svg,
    &.theme-default .board-host-svg {
        background-color: #ffffff;
    }
    &.theme-soft .board-host-svg {
        background-color: #f5f5f5;
    }
    &.theme-retro .board-host-svg {
        background-color: #f9f8ed;
    }
    &.theme-dark .board-host-svg {
        background-color: #141414;
    }
    &.theme-starry .board-host-svg {
        background-color: #0d2537;
    }
}