*,
::before,
::after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
:root {
  --dark-c: #444;
  --light-c: #f3f3f3;
  --bg-c: #eee;
  --border-radius: 25px;
}
body {
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  height: 100vh;
  background: url(./Running.jpg) center/cover no-repeat;
  position: relative;
  z-index: 1;
}
.overlay {
  position: absolute;
  height: 100vh;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2;
  top: -45px;
  left: 0;
}
.container {
  position: relative;
  z-index: 3;
  width: 400px;
  margin: 30px auto;
  text-align: center;
  padding-top: 30px;
}
h1,
h2 {
  font-weight: 100;
  font-size: 5rem;
  text-transform: uppercase;
  color: #fff;
  letter-spacing: 2px;
}
.btn {
  border-radius: 50%;
  width: 100px;
  height: 100px;
  font-weight: 200;
  box-shadow: inset 0 0 10px 1px rgba(0, 0, 0, 0.5);
  color: #f3f3f3;
}
.btn:active {
  box-shadow: inset 0 0 10px 1 rgba(0, 0, 0, 0.3);
}
.lap-time {
  width: 400px;
  font-size: 4rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-c);
  border: 1px solid #eee;
  box-shadow: inset 0 0 10px 1px rgba(0, 0, 0, 0.8);
  margin: 20px auto;
}
.controls {
  margin-top: 5vh;
  display: flex;
  justify-content: space-between;
  margin: 2rem auto;
}
.laps-container {
  max-width: 400px;
  margin: 2rem auto;
  font-size: 2rem;
  text-decoration: none;
}
.laps-container span {
  letter-spacing: 3 px;
}
.laps-container li {
  border-radius: var(--border-radius);
}
.laps-container li:nth-child(odd) {
  background-color: var(--light-c);
}
.laps-container li:nth-child(even) {
  color: var(--light-c);
  background-color: rgba(0, 0, 0, 0.8);
}