* {
  margin: 0;
  padding: 0;
  font-family: monospace, sans-serif, serif;
  box-sizing: border-box;
}

body {
  background: #242424;
}

.stopwatch {
  width: 90%;
  max-width: 600px;
  background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8));
  text-align: center;
  padding: 40px 0;
  color: #ffffff;
  margin: 200px auto 0;
  box-shadow: 0 10px 10px rgba(0, 0, 0, 0.8);
}

.stopwatch h1 {
  margin: 40px;
  font-size: 64px;
  font-weight: 300;
}

.buttons {
  display: flex;
  align-items: center;
  justify-content: center;
}

.buttons img {
  width: 50px;
  margin: 0 20px;
  cursor: pointer;
  border-radius: 50%;
  background: orangered;
}

.buttons img:hover {
  border: 2px solid orangered;
}

.buttons img:nth-child(2) {
  width: 80px;
  background: turquoise;
}

.buttons img:nth-child(2):hover {
  border: 2px solid turquoise;
}

.buttons img:nth-child(3) {
  padding: 8px;
}

.buttons img:nth-child(1) {
  padding: 6px;
}

@media (max-width: 420px) {
  .stopwatch h1 {
    font-size: 40px;
    margin: 20px;
  }

  .buttons img {
    width: 40px;
    margin: 0 10px;
  }

  .buttons img:nth-child(2) {
    width: 60px;
  }

  .buttons img:nth-child(3) {
    padding: 4px;
  }

  .buttons img:nth-child(1) {
    padding: 4px;
  }
}