* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "lato", "sans-serif";
}
body {
  background: url(../images/download.jpg) no-repeat center center/cover;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.header {
  position: fixed;
  top: 0;
  background: white;
  width: 100%;
  padding: 10px;
  list-style: none;
}
.header li {
  width: fit-content;
  transition: 0.5s;
}
.header li a {
  text-decoration: none;
  color: black;
}
.header span {
  margin-left: 10px;
}
.header li:hover i {
  animation: arrow 0.5s infinite ease-out;
}
.header li:hover {
  background-color: #3d3d3d2d;
}
@keyframes arrow {
  from {
    transform: translateX(-5px);
  }
  to {
    transform: translateX(4px);
  }
}
h1 {
  color: #fff;
  font-size: 70px;
}
.container {
  width: 60%;
  height: 250px;
  background-color: #fff;
  border-radius: 30px;
  box-shadow: 0 0 3px;
}
#timer {
  width: 100%;
  font-size: 72px;
  text-align: center;
  margin: 0 auto;
  padding-top: 35px;
}
@media (max-width: 991px) {
  #timer {
    font-size: 60px;
  }
}
@media (max-width: 390px) {
  #timer {
    font-size: 40px;
  }
}
.buttons {
  text-align: center;
  margin-top: 40px;
}
button {
  margin: 0 10px;
  border: none;
}
button i {
  font-size: 2rem;
  padding: 10px;
  color: #fff;
  width: 50px;
}
#play {
  background-color: green;
}
#pause {
  background-color: orange;
}
#reset {
  background-color: red;
}