body { 
  margin: 0;
  padding: 20px;
  color: darkblue; 
  background-color: #A7C7E7; 
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
} 

div { 
  margin: 50px auto; 
  text-align: center; 
  display: flex;
  flex-direction: column;
  align-items: center; 
  background-color: lightblue; 
  border-radius: 25px; 
  padding: 20px; 
} 

button { 
  background-color: lightskyblue; 
  color: darkblue; 
  border-radius: 25px; 
  font-size: 2.5rem; 
  padding: 30px 60px; 
  font-family: Tahoma, sans-serif; 
  border: none;
  cursor: pointer;
} 

button:hover { 
  background-color: darkblue; 
  color: white; 
} 

.startTimer { 
  padding: 10px 20px; 
} 

h3 { 
  font-size: 100px; 
  margin: 30px 0; 
  font-family: monospace; 
} 


.click {
  font-size: 100px;
  padding: 30px 300px;
  border-radius: 50px;
}

.heading {
  font: 35px;
}

.hidden {
  display: none;
}

.result {
  display: block;
  padding: 30px 100px;
  background-color: rgb(0, 213, 255);
}

h4 {
  font-size: 50px;
}

header {
  vertical-align: top;
  width: 100%;
  text-align: right;
  align-items: right;
}

.nav {
  background-color: lightblue;
  border-radius: 15px;
  padding: 5px 10px;
  margin: 10px;
}