QR Code Component

Replace <div class="center"> with the main tag and add the alt attribute alt=" " to the img tag to fix the accessibility and error issue. click here for more on web-accessibility and semantic html

There is no need to style .img_container. Add a padding value for all the sides to .container instead of a margin value. padding: 15px

h1 must have the same font size as p and give p opacity: 0.5 for the faded color.

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

Hope am helpful.

Well done for completing this challenge. HAPPY CODING