html, body {
    height: 100%;
    width: 100%;
}

#container {
    display: flex;
    justify-content: center;
}

#form-signin {
    width:100%;
    max-width: 500px;
    margin: auto;
    padding: 15px;
}

#form-signin input[type="text"],
#form-signin input[type="password"] {
    margin-bottom: 1rem;
}