* {
  margin: 0px;
  padding: 0px;
  box-sizing: border-box;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

body {
  background-color: rgba(0, 0, 0, 0.7);
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  flex-direction: column;
}

.stopwatch {
  background-color: rgba(0, 0, 0, 0.9);
  padding: 20px;
  width: 250px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: xx-large;
  font-weight: 900;
  border-radius: 10px;
  margin-bottom: 20px;
}

.btn {
  margin: 15px;
  padding: 12px;
  background: none;
  border: none;
  color: #ffffff;
  border-radius: 5px;
  background-color: var(--clr);
  cursor: pointer;
}