Hey there, I've been looking around but can't find the solution.

I'm trying to change this label color

From this: 

.label--new {

1. background-color: var(--label-new-bg);

}
 

To this:

.label--new {

1.  background-color: rgb(207, 144, 144);

}
 
But when I write it into my theme.css, nothing is happening.
I did find this and tried changing the color, but that did not work either.

.label--sale { background-color: var(--label-sale-bg); }

.label--new { background-color: var(--label-new-bg); }

.label--hot { background-color: var(--label-hot-bg); }

.label--out-stock { background-color: var(--label-out-stock-bg); }

.label--in-stock { background-color: var(--label-in-stock-bg); }

.label--pre-order { background-color: var(--label-pre-order-bg); color: var(--label-pre-order-c); }

Last but not least, the file  theme.scss.liquid does not seem to exist. 

What am I doing wrong? Hope you can help.