Your form by default will show a banner and when being opened in a stage subsequent to Start will also show a Toolbar. You can hide these by adding the following CSS.
Hint: you can add CSS directly into an HTML Fragment by using the <Style> Tag.
<Style>
.lfMn.lotusui30 .lotusBanner
{
display:none;
}
.lfMn.lfSingleFormArea .lfFormTitleBar {
display:none;
}
</Style>