.popper-menu {
    position: absolute;
    z-index: 1000;
    display: none;
    min-width: 160px;
    padding: 0;
    margin: 0;
    font-size: 16px;
    color: #212529;
    text-align: left;
    list-style: none;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, .15);
    border-radius: .25rem;
}

.popper-menu.show {
    display: block !important;
}