Used picture tag and srcset for responsive images

There is no need to give the body a margin value. To center .card on the page using grid, add min-height:100vh to the body.

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

For the color of the image , wrap the picture in a figure tag , give the figure a background-color of soft violet and the img a a width and height of 100%, objectfit: cover, mix-blend-mode: multiply and opacity: 0.8.

<figure><picture><img></picture></figure>

figure{
background-color: hsl();
}
img{
width: 100%;
height: 100%;
object-fit: cover;
mix-blend-mode: multiply;
opacity: 0.8;
}

Hope am helpful.

Well done for completing this challenge. HAPPY CODING