.cu-textarea .tip {
  position: absolute;
  right: 0;
  bottom: 5rpx;
}
.cu-textarea .bg {
  position: relative;
  width: 100%;
  border-radius: 12rpx;
  overflow: auto;
  box-sizing: border-box;
  border: 1rpx solid #eee;
}
.cu-textarea textarea {
  line-height: 1.2em;
  flex: 1;
  font-size: 28rpx;
  padding: 0;
  box-sizing: border-box;
  display: inline-block;
  vertical-align: top;
}
.cu-textarea textarea .placeholder {
  color: transparent;
}
.cu-textarea textarea::after {
  content: attr(data-placeholder);
  color: gray;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  -webkit-transition: 0.2s;
  transition: 0.2s;
  opacity: 1;
}
.cu-textarea textarea.value::after {
  opacity: 0;
}
.cu-textarea textarea[disabled],
.cu-textarea textarea[disabled] .placeholder {
  color: transparent;
}