.accordion-button:not(.collapsed) {
    color: #545454;
    background-color: rgb(247, 247, 247);
}

.accordion-button:focus {
   border-color: #545454;
   box-shadow: 0 0 0 .25rem rgba(84, 84, 84, 0.21);
}
button:not(.collapsed)::after {
    background-image: none;
}

.accordion-button:not(.collapsed)::after {
   background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%545454'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}
.accordion-button {
    font-size: 18px;
}