/*追加*/
.form-control:disabled, .form-control[readonly] {
    /*background-color: #e9ecef;*/
    background-color: var(--bs-secondary-bg);
    opacity: 1;
}
/*追加*/
.form-control:disabled:focus,
.form-control[readonly]:focus {
    /*color: var(--bs-body-color);*/
    border-color: #ccc;
    background-color: var(--bs-secondary-bg);
    outline: 0;
    box-shadow: none;
}