.login #login h1 a {
    width: 100%;
    max-height: calc(100vh - 500px);
}
.login #login h1 .customLogo {
    text-indent: 0;
    height: auto;
    background: none;
}
.login #login h1 .customLogo img {
    width: auto;
    max-width: 100%;
    height: auto;
    max-height: calc(100vh - 500px);
    vertical-align: middle;
}