html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
    box-sizing: border-box;
}
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section, main {
    display: block;
    box-sizing: border-box;
}
body {
    line-height: 100%;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
    text-align: left;
}
img {
    vertical-align: bottom;
}

html {
  font-size: 62.5%;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "ヒラギノ角ゴ ProN W3", "Hiragino Kaku Gothic ProN", 'メイリオ', Meiryo, sans-serif;
    font-weight: 300;
    font-size: 100%;
    line-height: 180%;
    color: #231815;
    background-color: #ffffff;
    font-feature-settings : "palt";
    -webkit-text-size-adjust: 100%;
}

#test-container {
    width: 100%;
    max-width: 688px;
    margin: 0 auto;
    padding: 48px 24px;
}
#test-container h1 {
    font-size: 16px;
    line-height: 26px;
    text-align: center;
    margin-bottom: 16px;
}

#video-container {
    position: relative;
    width: 100%;
    padding-bottom: 74%;
}
#video-container iframe {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
}