.bola{
  line-height: 1.65em;
  font-weight: bold;
  font-size: 11em;
  color: black;
  font-family: 'Roboto', sans-serif;
  width: 700px;
  height: 700px;
  position: absolute;
  right: -10px;
  top: -10px; 
  transition: all 400 ease-in;
  z-index:0;
}
.bola1{
    z-index:0;
}