I loved the "School Chalkboard" clip art, but needed it to be blank for the sign, so I removed the words.<br/>黑色的黑板<br/>board、chalk、chalkboard、eraser、remix 221018、school<br/>板、粉筆、黑板、橡皮、混音221018、學校<br/>資料來源：openclipart ( https://openclipart.org/ )