I have this fixed in the new update (which will be coming soon). All you would need to do is make a slight change to this in your style.css (line 467)
button:hover,
input:hover[type="button"],
input:hover[type="reset"],
input:hover[type="submit"],
.button:hover,
button:focus,
input:focus[type="button"],
input:focus[type="reset"],
input:focus[type="submit"],
.button:focus {
background-color: #fa5738;
color: #fff;
}
Replace the background color with #333
….I have it set to #000 by default in the update, but you can use whichever color you want.
Let me know if that helps.