* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

button {
  background-color: #008f53; /* Green */
  border: 0;
  color: white;
  padding: 14px 14px;
  text-align: center;
  font-size: 16px;
  margin: 2px 2px;
  width: 100px;
}

.counter {
  color: #008f53;
  font-size: 48px;
  text-align: center;
}

.footer {
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  margin-top: 20px;
  text-align: left;
  font-size: 12px;
  color: #aaa;
  visibility: visible;
}

.panel {
  display: flex;
  justify-content: center;
}