Landing Page in Mobile

Hello,

My name is Diana and I have a blog. Yesterday I installed your plugin for WordPress and I made a landing page that you can see at this link: https://cultivosdacaseiro.pt/aniversario-plantit-oferta-ebook-caderno-pratico-de-cultivos/

The page works perfectly but in some browsers the colors that I used for text boxes sample text aren’t the same…can you please help me?

The page I need help with: [log in to see the link]