body {

  font-family: Arial, Helvetica, sans-serif;
  background-image: url(https://images.pexels.com/photos/268533/pexels-photo-268533.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-attachment:fixed ;
}
.container {
  height: 300px;
  width: 300px;
  background-color:rgb(0, 0, 0 , .5);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  border-radius: 100%;
  color: white;
  font-weight: bold;
  border-radius: 150px;

  border-radius: 50%;
  box-shadow:  5px 5px 10px #595959,
               -5px -5px 10px #797979;
}

.timer {
  text-align: center;
  margin-top: 30%;
  font-size: 2.2rem;
}

.footer {
  text-align: center;
  margin-top: 20%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.play-btn,.reset-btn {
  height: 40px;
  width: 80px;
  border-radius: 10px;
  margin: 10px;
  border: none;
  padding: 5px;
  font-size: 1rem;
  transition: .5s;
}

.play-btn {
  background-color: green;
  color: white;
  
}
.play-btn:hover {
  background-color: white;
  border: 3px solid green;
  color: black;
}
.reset-btn {
  background-color: red;
  color: white;
}

.reset-btn:hover {
  background-color: white;
  color: black;
  border: 3px solid red;
}