html,
body {
    height: 100%;
}

.form-signin {
    width: 100%;
    max-width: 450px;
    margin: auto;
}

body {
    background-color: #f2f2f2;
    align-items: center;
}
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.header {
    text-align: center;
    background-color: #007bff; 
    color: white;
    padding: 10px 0;
}
.header img {
    max-width: 300px; 
    filter: none; 
}