.card-header {
    background-color: rgba(255, 255, 255, .5) !important;
}
.register_button, .btn-primary {
    color: #ffffff;
    background-color: #819691;
    border-color: #819691;
}
.register_button:hover, .btn-primary:hover {
    color: #ffffff;
    background-color: #819691;
    border-color: #819691;
    opacity: 0.85;
}
.btn-warning, .singin_button {
    color: #ffffff;
    background-color: #264532;
    border-color: #264532;
}
.btn-warning:hover, .singin_button:hover{
    color: #ffffff;
    background-color: #305941;
    border-color: #305941;
}