h3 {
    /* 文字色を濃いグレーに変更 */
    color: var(--main-text-color); 
    font-size: 2rem; 
    text-align: center;
    margin: 50px;
    letter-spacing: 0.2em; 
    font-weight: bold;
}

.main img{
    display: flex;
    justify-content: center;

    width: 100%;
    max-width: 1000px;
    width: 20%;

    margin: 0 auto;
    gap: 15px;
    padding: 20px 0;
}