Thanks Sebastian,

Finally I was able to set the height of the login window using this CSS style:

.dnnFormPopup .ui-dialog-content {
height: 135px !important;
}

I am not sure if this would affect anything else too besides the login window since it looks like is referring to popup in general


These are all the styles that I used in addition to your blog post:
/* Hide "Retrieve Password" link */
#dnn_ctr_Login_liPassword {display:none;}


.dnnFormPopup .ui-dialog-content {
height: 135px !important;
}
.dnnFormItem label {
width: auto !important;
}
.dnnLoginService a.dnnPrimaryAction {
margin-left: 93px;
}
.dnnLoginRememberMe {
margin-left: 185px;
}


It worked for me, but you can correct me if I didn't follow good practice and it might have some side effects.

Thanks,
Steven