* {
  margin: 0;
  box-sizing: border-box;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgb(231, 228, 228);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main{
    background-color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 7px;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    width: 50vw;
    height: 40vh;
}

h1{
    margin: 10px;
}

label{
    margin-top: 15px;
    font-weight: bold;
    font-size: 15px;
}

#date-input{
    width: 20vw;
    margin: 10px;
    padding: 10px;
}

#submit-btn{
    padding: 10px;
    color: white;
    background-color: blue;
    border: none;
    border-radius: 5px;
}

#submit-btn:hover{
    background-color: rgb(4, 4, 170);
    transition: 0.3s;
}

#age-display{
    font-size: 25px;
    font-weight: bold;
    padding: 5px;
    text-align: center;
}