/* fourierSeries.html 用 */
body { max-width: 760px; font-size: 1rem; }
.wave { margin: 0 0 2em; }
.wave h2 { font-size: 1.2em; margin: 0 0 .4em; }
.wave img { display: block; max-width: 100%; height: auto; margin-bottom: .5em; }
.wave video { display: block; max-width: 100%; height: auto; background: #000; }