如何让 ggplot Heatmap (R) 使用两种颜色？一种表示填充值介于 -.1 到 .1 之间，另一种表示不表示

 ggplot(base, aes(x,y, fill= base$`Equal Opportunity Difference`)) + 
        geom_tile() +
        #axis formatting
        scale_x_discrete(breaks = c(10, 20, 30, 40 , 50, 60, 70, 80, 90),
                       labels = c("10%", "20%","30%", "40%","50%", "60%", "70%","80%", "90%"),
                       limits = c(10,90)) +
        scale_y_discrete(breaks = c(10, 20, 30, 40 , 50, 60, 70, 80, 90),
                       labels = c("10%", "20%","30%", "40%","50%", "60%", "70%","80%", "90%"),
                       limits = c(10,90)) +
    
        geom_text(aes(label = signif(base$`Equal Opportunity Difference`,2)), color = "white", 
        size = 4) +
        scale_fill_gradient2(midpoint=c(-.1, s.1), low="#B2182B", high="#2166AC")

这就是我现在所拥有的，但它不起作用。此外，轴仅显示10%和90%，所以如果有人对此也有解决方案，我将不胜感激。