body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-image: url('https://images.unsplash.com/photo-1549880338-65ddcdfd017b');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

.login-box {
    background: rgba(255, 255, 255, 0.9);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 350px;
}

.login-box h2 {
    margin-bottom: 30px;
    font-size: 24px;
    color: #333;
}

.input-group {
    position: relative;
    margin-bottom: 30px;
}

.input-group input {
    width: 100%;
    padding: 10px 0;
    font-size: 16px;
    border: none;
    border-bottom: 1px solid #ccc;
    outline: none;
    background: transparent;
}

.input-group label {
    position: absolute;
    top: 10px;
    left: 0;
    font-size: 16px;
    color: #999;
    pointer-events: none;
    transition: 0.3s;
}

.input-group input:focus + label,
.input-group input:valid + label {
    top: -15px;
    font-size: 12px;
    color: #4CAF50;
}

button {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #45a049;
}

.main-header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    text-align: left;
    background-color: rgba(0, 0, 0, 0.3);
}

.main-header h1 {
    margin: 0;
    color: white;
    font-size: 36px;
    font-weight: bold;
}