index.css

*  {
    margin: 0;
    padding: 0;
}

body  {
    background-color: hsl(0, 0%, 81%);
    font-family: 'Barlow Semi Condensed', sans-serif;;
}

.card  {
    border-radius: 10px;
    color: #fff;
    margin: 20px;
    padding: 20px;
}

img  {
    border-radius: 100%;
    object-fit: contain;
    height: 60px;
    border: 1px solid  hsl(263, 55%, 72%);
}

.card-head  {
    display: flex;
}

.heading  {
    padding: 0  10px;
    margin-top: 10px;
}

.intro  {
    font-weight: bold;
    margin: 15px;
    font-size: 20px;
}

.subtitle  {
    color: hsl(0, 0%, 81%);
    opacity: 50%;
}

.review  {
    color: hsl(0, 0%, 81%);
    margin: 15px;
    opacity: 70%;
}

h4  {
    font-weight: 600;
}

.purple  {
    background-color: hsl(263, 55%, 52%);
    background-repeat: no-repeat;
    background-position: top right 40px;
    background-image: url(images/bg-pattern-quotation.svg);
}

.grey  {
    background-color: hsl(217, 19%, 35%);
}

.white1 , .white2 {
    background-color: #fff;
    color: hsl(225, 29%, 3%);
}

.white1 .subtitle , .white-review , .white2 .subtitle {
    color: hsl(0, 0%, 41%);
}

.grey-blue  {
    background-color: hsl(219, 29%, 14%);
}

.white2  {
    background-color: #fff;
}


@media screen and (min-width: 600px) {
    .card-container  {
        display: grid;
        grid-template-areas: 
        "purp purp gris whit2"
        "whit1 blac blac whit2";
        grid-template-columns: 1fr 1fr 1fr 1fr;
        grid-template-rows: 1fr 1fr;
    }
    
    .purple  {
        grid-area: purp;
    }

    .grey  {
        grid-area: gris;
    }

    .white1  {
        grid-area: whit1;
    }

    .white2  {
        grid-area: whit2;
    }

    .grey-blue  {
        grid-area: blac;
    }
}