Single price grid component solution - HTML, CSS, RWD, mobile first

Wrap <section class="insert"> within the main tag to fix the accessibility issue. click here for more on web-accessibility and semantic html

You forgot to give the body a background-color.

To center a content on a page using flexbox or grid:

• USING FLEXBOX: add min-height:100vh; display: flex; align-items: center: justify-content: center; to the body

body{
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
}

• USING GRID: Add min-height:100vh; display: grid place-items: center to the body

body{
min-height: 100vh;
display: grid;
place-items: center;
}

Hope am helpful.

Well done for completing this challenge. HAPPY CODING