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If you want to make your card responsive with ease you can use this technique:

.card {
width: 90%;
max-width: 37.5rem;
}

On the smaller screens card will be 90% of the parent (here body), but as soon as the card will be 37.5rem (600px) it will lock with this size.

Also to put the card in the center I advise you to use this code snippet:

.container {
display: grid;
place-items: center;
}

Hope you found this comment helpful 💗💗💗

Good job and keep going 😁😊😉

Need to align vertically. To align vertically and horizontally use justify-content:center and align-items:center after adding display property of body to flex.