body {
    transition: opacity 0.5s ease;
    background-color: #ffffff;
}

body.fade-out {
    opacity: 0;
}

.main {
    justify-content: center;
    width: 88%;
    margin: auto;
    align-items: center;
    text-align: center;
    color: #030a04;
}

.face-wrapper {
    width: 20%;
}

@media screen and (max-width: 480px) {
    .face-wrapper {
        width: 44%;
    }
}

.introduction-satoshi {
    justify-content: center;
    width: 100%;
    align-items: center;
    margin: auto;
}

.introduction-satoshi img{
    width: 40%;
    align-items: center;
    margin: auto;
}

.introduction-satoshi a{
    text-decoration: none;
    color: #ffffff;
    width: 30%;
    padding: 10px 50px;
    border-radius: 10px;
    background-color: #3842d4;
}

/* swimマグロ */

@keyframes swim {
    0%, 100% { transform: translateX(0); 
        transform: rotate(-5deg);}
    50% { transform: translateX(-20px); 
        transform: rotate(7deg);}
  }

  .introduction {
    width: 80%;
    align-items: center;
    margin: auto;
  }

  .introduction-maguro{
    justify-content: center;
    width: 100%;
    align-items: center;
    margin: auto;

    background-color: rgb(41, 106, 191, 0.5);
    border-radius: 10px;
    border: #030a04 solid 5px;

    padding-top: 5vw;
  }

  .introduction-maguro img{
    width: 70%;
    align-items: center;
    margin: auto;
  }
  
  .maguro {
    animation: swim 2s infinite ease-in-out;
    width: 70%;
    height: 70%;
    object-fit: cover;
    margin: auto;
  }

  .introduction-desc{
    justify-content: center;
    width: 100%;
    align-items: center;
    margin: auto;
  }