CSS to change opinion scale button colour:
/* Normal state */
.ss_rating_input--classic .ss-answer-option--rating.ss-answer-option--bg{
background: rgba(236, 165, 0, 0.5);
}
/* Hover state */
.ss_rating_input--classic .ss-answer-option--rating.ss-answer-option--bg:hover{
background: rgba(236, 165, 0, 0.7);
}
/* Active state */
.ss_rating_input--classic .ss-answer-option--rating.ss-answer-option--bg.active{
background: rgba(236, 165, 0, 1);
}
