munaccount

Also, color will only change the text color.  You will have to use background-color if you want to change the button color itself.
.sqs-block-button:hover {
  background-color: red !important;
}
 

Try using the !important rule. It will override all other CSS specificity selectors.
.sqs-block-button:hover {
  color: red !important;
}
a:hover {
  color:red !important;
}