Versuchs mal so:
temp.content < styles.content.get
temp.content {
select.where = colPos = 0
}
config.doctype = html5
page = PAGE
page.typeNum = 0
page.10 = FLUIDTEMPLATE
page.10 {
file = fileadmin/templates/testtemplate.html
variables {
content_main < temp.content
}
}