html {
  margin: 0 auto;
  padding: 0;
  width: 100%;
  max-width: 960px;
  height: 100%;
  font-size: 14px;
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN',
    'Hiragino Sans', Meiryo, sans-serif;
}

.container {
  max-width: 960px;
}

.feather {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}