nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border: 3px solid #f1f1f1;
    border-radius: 5px;
    color: black;
    background-color: white;
}
.App {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; /* If you're centering the content */
    height: 100vh; /* Full height */
    margin-top: -100px; /* Move up */
  }

  body {
    background-color: #0C2D48;
    font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  }