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You can solve this by providing width of submit form . Here is the example for the same.
Same things applied for checkbox, given some width to checkbox also
You can see this forum for the reference: if you change your mind to use contact form 7 plugin: https://www.styledthemes.com/forum/search?query=contact%20form&childforums=1
Please use child theme style.css file to add custom css , so your changes will not on theme update.