.equation-li:after {
    position: relative;
    top: -8px;
    right: -5px;
    font-size: 18px;
    text-align: right;
    content: "×";
    height: 100%;
    color: #999;
}

.equation-li:hover:after {
    color: #000;
    font-weight: bold;
}

.accordion-option-last>button[aria-expanded='true'] {
    border-radius: 0px;
    border-bottom-width: 0px;
}

.accordion-option-solo>button[aria-expanded='true'] {
    border-top-left-radius: 0.5rem;
    /* 8px */
    border-top-right-radius: 0.5rem;
    /* 8px */
    border-bottom-right-radius: 0px;
    border-bottom-left-radius: 0px;
}