Make text show up on hover over button

<button type='submit' title='Add New Item'>+</button>

.addMore{
  border: none;
  width: 32px;
  height: 32px;
  background-color: #eee;
  transition: all ease-in-out 0.2s;
  cursor: pointer;
}
.addMore:hover{
  border: 1px solid #888;
  background-color: #ddd;
}

<button class="addMore" title="Hover on me!">+</button>

<button class="addMore" title="click here">+</button>