antrean-operasi/scss/components/_VExpansionpanel.scss

.v-expansion-panel-title__overlay{
    background: rgba(var(--v-theme-primary));
}
.v-expansion-panel:not(:first-child)::after {
    border-color: transparent !important;
}
.v-expansion-panel-text{
    color: rgba(var(--v-theme-textSecondary));
}