Mobile First QR-code Component

Hello, I congratulate you for having finished the challenge

For better control when you have few elements, it is better to manipulate the container and not the content, You can add flex-direction:column; to the body to have the card above the attribution section and a justify-content:center; to the center so you don't use margin on the card. something like that:

   body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--lightGrey-clr);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 15px;
    gap: 30px;
}
    
    .card {
    background-color: var(--white-clr);
    padding: 15px;
    text-align: center;
    border-radius: 17px;
    /* text-align: center; */
    /* margin: 0 1rem; */
    max-width: 300px;
}

.container {
    /* max-height: 100vh; */
    /* margin: 0 auto; */
    /* display: flex; */
    flex-direction: column;
    justify-content: center;
}

If you want, you can remove the container, so it could look a little better, I'll leave you with the task of adding a shadow so it would look prettier, I hope my contribution is helpful, gambaree.