QR code component

it looks good, also you cand declare the css with "styles.css" not index :), in other words, continue what you are doing :) like, practice make`s perfect

Replace <div id="container"> with the main tag and <h2> with <h1> to fix the accessibility issues. click here for more on web-accessibility and semantic html

To center #container on the page, add min-height:100vh; display: flex; align-items: center: justify-content: center; or min-height:100vh; display: grid place-items: center to the body.

To center #container on the page using flexbox:
body{
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
}

To center #container on the page using grid:
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

Increase the width of #container for it to be equivalent to the width of the design and there is no need to give it margin values. e.g.width:320px .

Give the img a max-width of 100% instead of a width and a height and a border-radius, the rest are not needed. There is no need to give .card a border value.

Give .details a margin value for all the sides and font size of 15px, this will be the font-size for both p and h1. Give p a margin-top value for the space between the text.

Hope am helpful.

Well done for completing this challenge. HAPPY CODING