* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  background: rgb(142, 219, 255);
  display: flex;
  align-items: center;
  justify-content: center;
}
.container {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.outer-body {
  width: 690px;
  min-height: 525px;
  background-color: rgb(136, 136, 136);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-evenly;
  border-radius: 40px;
}

.heading {
  font-size: 40px;
  width: 650px;
  text-align: center;
  border-radius: 15px;
  padding: 1rem 2rem;
  margin-bottom: 5px;
  color: rgb(238, 238, 238);
  text-shadow: 2px 2px 4px #000000;
}
.card {
  background-color: white;
  padding: 3rem;
  max-width: 600px;
  height: 300px;
  border-radius: 15px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.display-time {
  font-size: 70px;
  border-radius: 20px;
  padding: 0 1rem;
  text-align: center;
  color: white;
  text-shadow: 2px 2px 7px rgb(14, 2, 2);
}
.button-container {
  display: flex;
  width: 100%;
  justify-content: center;
  gap: 0.3rem;
  align-items: center;
  padding: 1rem;
}
.btn {
  padding: 1rem 2rem;
  border-radius: 15px;
  border: none;
  background-color: #e1e1e1;
  font-size: 24px;
  cursor: pointer;
}
.btn:hover {
  background-color: #d9d9d9;
  box-shadow: 2px 2px 7px red;
}
@media (max-width: 720px) {
  .btn {
    padding: 1rem 1.5rem;
    font-size: 20px;
  }
  .display-time {
    font-size: 60px;
    padding: 0 0.6rem;
  }
}
@media (max-width: 520px) {
  .display-time {
    font-size: 50px;
    padding: 0 0.2rem;
  }
}