giri_font.css

@font-face {
  font-family: "giri_font";
  src: url(giri_font.ttf) format("truetype");
}

#test-area {
  background-color: transparent;
  border: 0;
  outline: 0;
  font-family: "giri_font", "Noto Sans JP";
  font-size: 40px;
  line-height: 50px;
  resize: none;
  width: 100%;
  height: 100px;
}

::placeholder {
  font-size: 40px;
  line-height: 50px;
}