Just a quick update, maybe someone who speaks English will find this useful. I managed to change the appearance of the René theme with this code and adding !important to the end to give priority to the code all over the css configuration in the stylesheet:
Codice:
.footer-content {
border-top: none !important;
background-color: #fff !important;
}
.av-credit-link,
.av-custom-footer {
background-color: #fff !important;
}
After that I only had to purge the altervista cache and everything is working fine now