html {
    font-size: 62.5%;
}

body {
    background-color: #f2f2f2;
    font-family: "Noto Sans JP", sans-serif;
}

h1 {
    text-align: center;
    color: #71bbcd;
    font-size: 2.8rem;
    margin: 20px 0;
}

h2,
h3 {
    font-size: 1.8rem;
    margin: 20px 0 5px;
}

p {
    font-size: 1.4rem;
    margin: 0;
    line-height: 1.5;
}

ul {
    list-style: none;
    font-size: 1.4rem;
    padding-left: 20px;
}

.main-box {
    margin: 20px 40px;
    box-sizing: border-box;
}



@media (max-width: 768px) {
    h1 {
        font-size: 2.0rem;
    }

    h2,
    h3 {
        font-size: 1.4rem;
    }

    p {
        font-size: 1.2rem;
    }

    ul {
        font-size: 1.2rem;
        padding-left: 10px;
    }

    .main-box {
        margin: 20px 20px;
        box-sizing: border-box;
    }
}