:root{
    --black: #2e2e2e;
    --pink: #e42a89;
}

html{
    width: 100%;
    margin: 0 auto;
    font-family: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, "MS Pゴシック", "MS PGothic", sans-serif;
    color: var(--black);
    line-height: 160%;
    text-align: center;
}

img {
    max-width: 100%;
    vertical-align: bottom;
    height: auto;
}

h2 {
    font-size: 150%;
    font-weight: bold;
}

h3 {
    font-size: 130%;
    font-weight: bold;
}

.indent {
    text-indent: -1em;
    padding-left: 1em;
}

header {
    display: flex;
    padding: 2%;
    align-items: center;
    justify-content: space-between;
}

header section {
    width: 20%;
}

header ul {
    width: 50%;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

header ul > li {
    border-bottom: 5px solid var(--pink);
    padding: 1% 5%;
    font-size: 150%;
    font-weight: bold;
}

main {
    width: 1000px;
    max-width: 90vw;
    margin: 5% auto 10% auto;
}

.volunteer {
    background: #fffcd2;
    padding: 5% 5% 3% 5%;
    margin-top: 10%;
}

.volunteer h2 {
    color: var(--pink);
}

.volunteer a {
    text-decoration: none;
    background: var(--pink);
    padding: 3% 0;
    color: #fff;
    border-radius: 50px;
    margin: 2% auto;
    display: block;
    width: 60%;
}

.news {
    text-align: left;
}

.news h2 {
    color: var(--pink);
    text-align: center;
    margin-bottom: 5%;
}

.news h3 {
    margin: 5% 0 1% 0;
    border-bottom:3px solid var(--pink);
    position: relative;
    padding: 0.5em 0.5em 0.5em 1.7em;
}

.news h3:before{
    content: "";
    position: absolute;
    background: var(--pink);
    top: 0;
    left: 0.4em;
    height: 12px;
    width: 12px;
    transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
}

.news h3:after{
    content: "";
    position: absolute;
    background: var(--pink);
    top: 1.0em;
    left: 0;
    height: 8px;
    width: 8px;
    transform: rotate(15deg);
    -moz-transform: rotate(15deg);
    -webkit-transform: rotate(15deg);
    -o-transform: rotate(15deg);
    -ms-transform: rotate(15deg);
}

footer {
    background: var(--black);
    margin-top: 5%;
    padding: 5%;
    color: #fff;
    font-size: 150%;
}

@media screen and (max-width:640px) {

    h2 {
        font-size: 120%;
    }

    .news h3 {
        margin: 10% 0 3%;
        font-size: 110%;
    }

    header {
        flex-direction: column;
        padding: 5% 1%;
    }

    header section {
        width: 60%;
        padding: 3% 0;
    }

    header ul {
        width: 100%;
        padding-bottom: 3%;
    }

    header ul > li {
        font-size: 80%;
        padding: 1% 3%;
        line-height: 120%;
    }

    footer {
        font-size: 80%;
        margin: 0 auto;
    }
}