.bt_group .black_bg {
    border: 2px solid #343d46 !important;
    background: #fff !important;
    color: #343d46;
    width: 100%;
    border-radius: 20px;
    padding: 8px;
    font-size: 18px;
}

.bt_group .black_bg:hover,
.bt_group .black_bg:focus {
    border: 2px solid #343d46 !important;
    background: #343d46 !important;
    color: #fff;
    width: 100%;
    border-radius: 20px;
    padding: 8px;
    font-size: 18px;
}

.color-blue {
    color: #00a7e1;
}

@media all and (max-width: 500px) {
    .bt_group .black_bg {
        font-size: 12px;
    }
    .bt_group .black_bg:hover,
    .bt_group .black_bg:focus {
        font-size: 12px;
    }
}