.editor{
  border: 1px solid #ccc;
  border-radius: 3px;
  overflow: hidden;
  font-family: sans-serif;
}

.toolbar{
  display: flex;
  justify-content: left;
  align-items: center;
  height: 30px;
  background-color: #f2f2f2;
  border-bottom: 1px solid #ccc;
}

.toolbar button{
  margin: 0 5px;
  padding: 0;
  width: 30px;
  height: 30px;
  background-color: transparent;
  border: none;
  font-weight: bold;
  cursor: pointer;
}

.content{
  min-height: 100px;
  padding: 10px;
  line-height: 1.4;
}

.content[contenteditable=true]:empty::before {
  content: attr(placeholder);
  color: #999;
  font-style: italic;
}