.btn-signi {
    color: white;
    background-color: #7031b4;
}

.btn-signi:hover, .btn-signi:focus {
    color: white;
    background-color: #551d91;
}

.btn-group > .btn-signi:hover, .btn-group > .btn-signi:focus {
    z-index: unset;
}