html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: #fff;
}

.survey-link {
  display: flex;
  min-height: 100vh;
  width: 100%;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  cursor: pointer;

  /* スマホのタップ反応を良くする */
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.survey-image {
  display: block;
  max-width: 100%;
  max-height: 100vh;
  width: auto;
  height: auto;
}