/* 1. SUSTITUCIÓN DEL LOGO */
[class*="logo"] img, [id*="logo"] img, .logo img, .login img, #login img, header img {
    content: url("/static/img/logo.png") !important;
    display: block !important;
    visibility: visible !important;
    max-height: 45px !important;
    width: auto !important;
}

/* 2. CENTRADO EN EL LOGIN */
.login .logo img, #login .logo img {
    margin: 0 auto 20px auto !important;
    max-height: 60px !important;
}