excalidraw/src/components/EditableText.css

.project-name {
  display: inline-block;
  cursor: pointer;
  border: none;
  padding: 0.25rem;
  margin: -0.25rem;
  white-space: nowrap;
  border-radius: var(--space-factor);
}

.project-name:hover {
  background-color: #eee;
}

.project-name:focus {
  outline: none;
  box-shadow: 0 0 0 2px steelblue;
}