main {
  width: 900px;
  margin: 0 auto;
}
#toolbar {
  margin-bottom: 20px;
}
#toolbar button {
  margin-right: 5px;
}
#editor {
  border: 1px solid #cccccc;
  border-radius: 8px;
  padding: 10px;
  width: 900px;
  height: 500px;
  overflow-y: auto;
}
p, li {
  margin: 0;
}
table {
  width: 100%;
  border-collapse: collapse;
}
table, th, td {
  border: 1px solid black;
}
[contenteditable] {
  outline: 0px solid transparent;
}
[contenteditable]:focus {
    outline: 2px solid rgb(255, 0, 212);
}