Manhattan plot how to reduce space between axis and axis-labels

Hello everyone,

I have plotted the Manhattan plot via qqman in R. However, it leaves huge white space between axis ticks and axis labels and also between axis labels and axis labs.

Could someone offer any tip to reduce the white space?

This is my code:

manhattan(TailMLS04B, chr="CHR", bp="BP", snp="SNP", p="P",
          suggestiveline = 4.66963295422, genomewideline = 5.97066294989, 
          ylim = c(0, 12), cex = 1.0, cex.axis = 0.5)