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To center the main on the page using flexbox or grid instead of margin,

• 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;
}

Use relative units like rem or em as unit for the padding, margin, width values and preferably rem for the font-size values, instead of using px which is an absolute unit. For more on CSS units Click here

Hope am helpful.

Well done for completing this challenge. HAPPY CODING

Can you remove the fixed position of the footer when the page is loaded footer comes on the section that does not look good as it cuts the button and image.