.nivel{display:flex;flex-direction:row;align-items:center}.nivel-padre{display:flex;flex-direction:column}button{align-items:center}.add{width:40px;height:40px;border:none;background-color:#fff;border-radius:40px;display:flex;flex-direction:column;justify-content:center}.add:hover{background-color:#a9a9a9}