.center {
    text-align: center;
}

.full-width {
    width: 100%;
    display: inline-block;
}

.half-width {
    width: 50%;
}

.hidden {
    display: none;
}

.success {
    color: green;
}

.error {
    color: red;
}

.centered-btn {
    margin: 10px auto !important;
}