#phone {
    padding: 8px;
    font-size: 16px;
    width: 100%;
    max-width: 300px;
}

input.valid {
    border-color: #46b450 !important;
    box-shadow: 0 0 0 1px #46b450 !important;
}

input.error {
    border-color: #dc3232 !important;
    box-shadow: 0 0 0 1px #dc3232 !important;
}