.login-box, .registration-box, .message-box {
    background: white;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(106, 137, 204, 0.15);
    width: 100%;
    max-width: 420px;
}
button {
    margin: 10px 0;
}
.oauth-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background: #4285F4;
    color: #fff;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 12px;
    text-decoration: none;
    font-weight: bold;
}
.oauth-btn:hover {
    background: #357ae8;
}