.accordion-button {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    color: #212529;
    text-align: left;
    background-color: transparent;
    border: 0;
    border-radius: 0;
    overflow-anchor: none;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out,border-radius .15s ease;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid #000;
    border-radius: 0!important;
}

.accordion-item {
     background-color: transparent;
    border: none;
    text-align: start;
}
.accordion-button:not(.collapsed) {
   color: #212529;
    text-align: left;
     background-color: transparent;
   box-shadow: none;
}
.accordion-button::after {
    flex-shrink: 0;
    width: 1.25rem;
    height: 1.25rem;
    margin-left: auto;
    content: "+";
    background-image:none;
    background-repeat: no-repeat;
    background-size: 1.25rem;
    transition: transform .2s ease-in-out;
}
.accordion-button:not(.collapsed)::after {
    content: "-";
    background-image:none;
    transform: rotate(0deg);
}