weseek__growi/resource/css/_form.scss

textarea {
  font-family: menlo, monaco, consolas, monospace;
  line-height: 1.1em;
}

textarea.form-body-height {
  height: 300px;
}

input::-webkit-input-placeholder {
  color: #ccc;
}
input:-moz-placeholder {
  color: #ccc;
}