textarea {
  width: 100%;
  height: 150px;
  padding-right: 50px; /* Adjust based on button width */
  box-sizing: border-box;
  resize: none;
}

.container {
  position: relative;
  display: inline-block;
}

button {
  position: absolute;
  top: 5px;
  right: 5px;
}