html,
body {
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    margin-bottom: 0; /* important: override template margin */
    background-color: var(--bs-body-bg);
}

.form-signin {
    max-width: 330px;
    padding: 15px;
}

    .form-signin .form-floating:focus-within {
        z-index: 2;
    }

/* default */
.logo {
    display: none;
}

/* Light theme */
html[data-bs-theme="light"] .logo-light {
    display: block;
}

/* Dark theme */
html[data-bs-theme="dark"] .logo-dark {
    display: block;
}