.signin-form {
    max-width: 400px;
    margin: 0 auto;
    padding: 40px;
    background: #2c3e50;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #ecf0f1;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #34495e;
    border-radius: 4px;
    background: #1b2631;
    color: #ecf0f1;
}

.btn {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 4px;
    background: #4db8b8;
    color: #ffffff;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #66d9d9;
}