Search button appears above form

I added a search field to a page using the code located at http://www.relevanssi.com/knowledge-base/adding-search-form-shortcode/. However, as you can see in the screenshot, the search button is appearing well above the input field. How can I get the button to appear directly below the input field? Thanks.

Screenshot: https://snag.gy/qJzS35.jpg

https://ww.wp.xz.cn/plugins/relevanssi/