having problem with margins

  <div class="container">
    <div class="leftContainer">
      <div class="cardFront">
        <div class="cardDetails">
          <img src="./images/card-logo.svg" alt="">
          <p class="cardNumber">0000 0000 0000 0000</p>
          <div class="cardName">
            <p>JANE APPLESEED</p>
            <p>00/00</p>
          </div>
        </div>
    </div>
    <div class="rightContainer"></div>
  </div>

  @import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Space Grotesk', sans-serif;
}
.body{
    font-size: 18px;
    
}
.container{
    min-height: 100vh;
}
.leftContainer{
    background-image: url('../images/bg-main-desktop.png');
    min-height: 100vh;
    width: 30%;
    margin: 0;
}
.cardFront{
    background-image: url("../images/bg-card-front.png");
    min-height: 13rem;
    border-radius: 0.4rem;
    width: 25rem;
    background-size: cover;
    margin: 4rem;
}
.cardDetails img{
    margin: 1.5rem;
}
.cardNumber{
    margin-top: 1rem;
    color: white;
    font-size: 1.4rem;
    text-align: center;
    word-spacing: 0.6rem;
    letter-spacing: 0.2rem;
}
.cardName{
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
    align-items: center;
    margin: 1rem 2rem;
    color: white;
}