Do you like the look and feel ._.

It's a good start. I appreciate the simplicity.

Some thoughts to consider if you're open to it:

• Consider making the text "Discover popular hashtags" your headline instead of "Hashtags Generator".
• Consider a lighter font weight for your secondary heading.
• Reduce the opacity of "Search Hashtags" so that it's less prominent.
• I wonder what it'd look like with the input border removed (or the opacity decreased).
• I'm not in love with the green and blue combo that you have (reminds me of the primary and success colors from Bootstrap). If you like it, stick with it. If you're open to new ideas, I like using sites like colorsinspo.com for inspiration. This is a palette that I noticed on that site that's similar-ish to yours (#40514e, #2f89fc, #30e3ca, #f5f5f5) - not sure if it'd look good or not.