<style>
#form-frame { height: 1600px; width: 100%; }

@media screen and (max-width: 1024px) {
#form-frame { height: 1600px; }
}
@media screen and (max-width: 860px) {
#form-frame { height: 1870px; }
}
@media screen and (max-width: 675px) {
#form-frame { height: 2100px; }
}
@media screen and (max-width: 500px) {
#form-frame { height: 2140px; }
}
@media screen and (max-width: 400px) {
#form-frame { height: 2300px; }
}
</style>

<iframe src="https://448734.extforms.netsuite.com/app/site/crm/externalleadpage.nl?c…; id="form-frame" frameborder="0"></iframe>