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

body {
  background-image: linear-gradient(to right, #3c0919, #7d1128);
}

@media (max-width: 567px) {
  .container {
    width: 90%;
  }
  html {
    font-size: 60%;
  }
}
@media (max-width: 767px) {
  .container {
    width: 90%;
  }
}
@media (min-width: 767px) {
  .container {
    width: 70%;
  }
}
.container {
  background-color: #060002db;
  padding: 20px 30px;
  margin: 5rem auto;
  text-align: center;
  border-radius: 20px;
}

h1 {
  color: white;
  margin: 1rem 0 2rem 0;
  font-size: 60px;
  letter-spacing: 4px;
}
button {
  font-size: 18px;
  background-color: #ff0000eb;
  border: none;
  padding: 10px 15px;
  border-radius: 10px;
  color: rgb(247, 242, 242);
  font-family: sans-serif;
}
.start,
.stop {
  margin-right: 20px;
}
button:hover {
  cursor: pointer;
}

.timer.animateStart {
  animation: start ease 2s;
}
@keyframes start {
  0% {
    color: white;
  }
  50% {
    color: green;
  }
  100% {
    color: white;
  }
}
.timer.animateStop {
  animation: stop ease 2s infinite;
}

@keyframes stop {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
  100% {
    opacity: 1;
  }
}