Making Logo Larger than 320px wide on Basil Template

Hi,

I am using the Basil Template, and my logo is kind of long, so when it is set to the max amount of 320px, it still isn't very big.

I've looked up how to do custom logo size via custom css, but that doesn't seem to be working. I did this in the custom css section, with enormously large numbers, and it didn't do anything to the logo size:

.site-title img {
 max-height: 1000000px;
 max-width: 4000000px;
}

Does the Basil template not support custom css logo sizes, or am I doing something wrong?