.btn {
    border: 0;
    background: black;
    color: white;

    &:hover {
        border: 0;
        background: red;
        color: white;
    }
}

.on {
    border: 0;
    background: red;
    color: white;
}

.btnBlock {
    background: gray;
    border: 0;
    color: white;
}