* {
  margin: 0;
  padding: 0;
}
body{
  background-color: #2c3350;

}

.main-container {
  width: 100%;
  display: flex;
  flex-direction: row;
  height: 100vh;
  justify-content: center;
  align-items: center;

}

.main-container .main {
  width: 70%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.main-container .main .main-body {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: #2c3350;
  padding: 10px;
  margin-top: 20px;
}

h1 {
  color: white;
  text-decoration: underline;
  text-align: center;
}

#container {
  color: #d7dfe4;
}

#time{
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-items: flex-end;
}

.digit {
  font-size: 150px;
  font-weight: bold;
}

.txt {
  font-size: 40px;
  font-weight: bold;
}

#btn-container {
  text-align: center;
  margin-top: 40px;
}

.btn {
  padding: 7px 25px;
  font-size: 15px;
  margin: 0 10px;
  color: white;
  cursor: pointer;
}

#start {
  background-color: #1abc9c;
}

#stop {
  background-color: #3498db;
}

#reset {
  background-color: #e74c3c;
}


@media screen and (max-width: 800px) {
  .main-container {
    flex-direction: column;
  }

  .main-container .main {
    width: 100%;
  }

  .digit {
    font-size: 40px;
    font-weight: bold;
  }
  
  .txt {
    font-size: 20px;
    font-weight: bold;
  }
}