* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 100px;
    font-family:'Reggae One', cursive;
}
main h1 {
    margin: 70px 0;
    font-size: 2.5em;
    color: #333;
    text-align: center;
}
main p {
    margin: 0 100px 40px 100px;
text-align: center;
}
main figure {
    margin: 20px 100px 100px 100px; /* 左右100pxのマージン */
    text-align: center;
    width: calc(100% - 200px); /* 左右400pxずつ引いた幅 */
}
figure img {
    width: 100%;
    height: auto;
    display: block;
}   
main h2 {
    margin: 70px 0;
    font-size: 2.5em;
    color: #333;
    text-align: center;
}