body {
  font-family: "Helvetica Neue",
  Arial,
  "Hiragino Kaku Gothic ProN",
  "Hiragino Sans",
  Meiryo,
  sans-serif;
  line-height: 2.0;
  background: white;
}

.wrapper {
  /* ドラッグで横幅を変更できる */
  resize: horizontal;
  overflow: auto;
  background: #f0f0f0;
  padding: 16px;
  font-size: 0.875rem;

  position: relative;

  &::after {
    content: "";
    display: block;
    position: absolute;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(135deg, #3223B3 0, #3223B3 50%, #FFFFFF00 50%);
    width: 24px;
    height: 24px;
    pointer-events: none;

    /* 明度のCSS変数 */
    --alpha: 1.0;
    animation: gradient 0.2s infinite;
    opacity: var(--alpha);
  }
}

h1, h2 {
  font-size: 1.0rem;
  font-weight: 900;
  color: #3223B3
}

.help {
  font-size: 0.75rem;
}

/* CSS変数の色のCSSアニメーション */

@keyframes gradient {
  0% {
    --alpha: 1.0;
  }
  50% {
    --alpha: 0.85;
  }
  100% {
    --alpha: 1.0;
  }
}