Tip: To fix your CSS, you're using Bootstrap but you're missing any '<div class="container">' or '<div class="container-fluid">'. One of those around your outer 'class="row"' (basically level below body) fixes your main issue.
(Then remove the negative margin on your Go button and/or use one of the better options bootstrap has for that kind of thing [1]).
(Then remove the negative margin on your Go button and/or use one of the better options bootstrap has for that kind of thing [1]).
[1] https://getbootstrap.com/docs/3.3/components/#input-groups-b...