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

body {
  background-color: black;
  font-family: Arial, Helvetica, sans-serif;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

h1 {
  font-size: 5rem;
  margin-bottom: 40px;
  font-weight: 700;
  color: cyan;
}

#clock-container {
  border: 8px solid cyan;
  text-align: center;
  padding: 20px;
  border-radius: 20px;
  background-color: navy;
}

#clock {
  font-family: monospace;
  font-size: 6.5rem;
  font-weight: 700;
  color: gold;
}

#controls {
  margin: 30px 50px 10px 50px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

#start,
#stop,
#reset {
  display: inline-block;
  border: none;
  padding: 7px 30px;
  font-size: 2rem;
  border-radius: 13px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.5s ease;
}

#start {
  background-color: lime;
}

#stop {
  background-color: red;
}

#reset {
  background-color: lightskyblue;
}

#start:hover {
  background-color: rgba(0, 255, 0, 0.6);
}

#stop:hover {
  background-color: #ff000089;
  margin: 0 50px;
}

#reset:hover {
  background-color: rgba(135, 206, 250, 0.6);
}

#start:active {
  background-color: hsla(120, 100%, 50%, 1);
}

#stop:active {
  background-color: #ff0000;
  margin: 0 50px;
}

#reset:active {
  background-color: rgba(135, 206, 250, 1);
}