You've done a great job on your project! Here are a few tips to help you improve further:
Firstly, make sure to utilize the README file provided by Frontend Mentor, as it includes the necessary fonts and colors to prevent any issues with color mixing. For example, you can use the linear gradient syntax in CSS like this: background: linear-gradient(direction, color1, color2, ...);.
Additionally, while you did an excellent job with the CSS Grid, don't forget to include gaps for better spacing using grid-gap: 20px;.
When it comes to using headers (h1, h2, etc.), remember it's not just about font size. Use h1 for the most important heading (only one per page) and proceed with h2, h3, etc., in descending order of importance.
Overall, you did well and can further improve by practicing. Once you're confident, try the challenge again and post a new solution. Keep up the good work!