At present we are not using any specific border for the contact forms. It is using the default style.css file of your theme.
If you want to remove the border from the contact form please do as follows.
We are using an html table structure for the contact form. Here we are trying to add a style class to the table.
First you need to create a style tag as given below in the style.css file.
(Here “nolines” is the name given to the style class.)
Now in the contact form creating page, please select the html section and modify the table tag as
<table class="nolines" >
Now save the contact form and check the public side.