#main-area {
  border: solid 1px gray;
}
#btn-area {
  width: 100%;
  height: 32px;
  background-color: aqua;
  padding: 2px 8px;
}
#btn-area .button {
  display: inline-block;
  border: solid 1px gray;
  border-radius: 4px;
  font-size: 0.7rem;
  line-height: 26px;
  height: 26px;
  padding: 0 4px;
}
.right {
   float: right;
}
.left {
  float: left;
}
textarea {
  padding: 8px;
  width: 100%;
  height: 70vh;
  border: none;
  resize: none;
  scrollbar-width: thin;
}

textarea:focus {
  outline: none;
}