html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
}

body {
    background:
        linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)),
        url("images/library_bg.jpg") no-repeat center center;
    background-size: cover;
}

/* Login box */
.container {
    width: 300px;
    background: white;
    padding: 40px;
    margin: 100px auto;
    border-radius: 5px;
    box-shadow: 0 0 10px gray;
}

h2 {
    text-align: center;
}

input, select, button {
    width: 100%;
    padding: 8px;
    margin: 8px 0;
}

button {
    background: #2c7be5;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #1a5dcc;
}

a {
    color: blue;
    text-decoration: none;
}

#msg {
    text-align: center;
    color: red;
}