body {
  font-family: 'Arial', sans-serif;
  background-color: #f0f0f0;
}

.container {
  max-width: 400px;
  margin: 0 auto;
  padding: 2rem;
  background-color: white;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}

.header {
  display: flex;
  padding: 1rem;
  justify-content: space-around;
}

h1 {
  font-size: 2rem;
  font-weight: bold;
  color: #444;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 1.5rem;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: #ffffff;
  background-color: #007bff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.timer {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100%;
  font-size: 3rem;
  font-weight: bold;
}

.timer span {
  margin: 0 0.5rem;
}

.buttons-container {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

#lap-list {
  max-height: 100px;
  overflow-y: auto;
}


#background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: background-color 1s;
  z-index: -1;
}