body.dark textarea {
  background-color: #444;
  border: 1px solid lightblue;
}
body:not(.dark) textarea {
  border: 1px solid blue;
  background-color: #aaa;
}
textarea {
  padding: 5px 10px;
  font-size: 18px;
  width: 100%;
  height: 120px;
  resize: vertical;
  border-radius: 10px;
}

#img-pos {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 400px;
  padding-left: 100px;
  background-color: #fff;
}

#hukidashi {
  pointer-events: none;
}

#iruka {
  position: relative;
  top: 90px;
  left: -30px;
  pointer-events: none;
}

#text {
  position: relative;
  color: #243c4d;
  font-size: 21px;
  transform: rotate(-10deg);
  bottom: 210px;
  left: 50px;
  text-align: center;
  width: 220px;
  line-height: 30px;
  font-family: sans-serif;
}

#text > * {
  color: #243c4d;
}