body {
  font-family: Arial, sans-serif;
}

main {
  display: flex;
  flex-wrap: wrap;
  font-size: 32px;
  justify-content: center;
}

.counter {
  margin: 10px 20px;
}

.num {
  font-size: 72px;
  line-height: 72px;
  text-align: center;
}

.bt {
  margin-top: 10px;
  background-color: mediumpurple;
  color: #fff;
  font-size: 32px;
  border: 0;
  border-radius: 8px;
  padding: 10px 15px;
  width: 100%;
  line-height: 32px;
  cursor: pointer;
  transition-duration: 0.12s;
  box-shadow: 2px 2px 2px #999;
}

.bt:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 4px #aaa;
}

.bt:active {
  transform: translateY(5px);
  box-shadow: 0 1px 1px #999;
}


.good {
  color: green;
}

.bad {
  color: darkred;
}