Hi mponzi, I had the same problem and the developer sent me back the instructions below to fix it up. Now works perfectly. I had to put the code in immediately after the @media only …. 480px as shown below though – if you put it anywhere else it doesn’t seem to work (well for me anyway). This fix worked perfectly.
Cheers
Leanne
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Just add the above code right under the 480 media query section near the bottom of your css like this –
@media only screen and (max-width: 480px) {
.header-image .site-title a {
background-size: contain !important;
}