.bottom-navigation {
  position: fixed;
  bottom: 30px;
  left: 0;
  z-index: 1;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  width:100%;
  padding-left:50px;
}


button.back-button {
  display: inline-block;
  padding: 15px 25px;
  font-size: 24px;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  outline: none;
  color: #fff;
  background-color: #04AA6D;
  border: none;
  border-radius: 15px;
  box-shadow: 0 9px #999;
}

button:hover.back-button {
  background-color: #3e8e41
}

button:active.back-button {
  background-color: #3e8e41;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}


button.next-button {
  display: inline-block;
  padding: 15px 25px;
  font-size: 24px;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  outline: none;
  color: #fff;
  background-color: #04AA6D;
  border: none;
  border-radius: 15px;
  box-shadow: 0 9px #999;
}

button:hover.next-button {
  background-color: #3e8e41
}

button.next-button:enabled:active {
  background-color: #3e8e41;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}

button.next-button:disabled{
  background-color: #666;
}



button.restart-button{
  display: inline-block;
  padding: 15px 25px;
  font-size: 24px;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  outline: none;
  color: #fff;
  background-color: red;
  border: none;
  border-radius: 15px;
  box-shadow: 0 9px #999;
}

button.restart-button:active {
  background-color: #e6513e;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}