.imgcontainer > img {
    display: block;
    float:right;
}

.container-login {
    padding: 10px 10px 10px 10px;
    min-width:300px;
}

span.wachtwoord {
    float: right;
}

@media (min-width: 600px) {
    .container-login {
        position: fixed;
        max-width: 500px;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}