body {
  font-family: Tahoma, Arial, sans-serif;
  background-color: #f4f4f4;
  text-align: center;
}

h1 {
font-size:19px;
margin-top: 0;
margin-bottom: 5px;
border-bottom: 1px solid black
  }

h2 {
font-size:17px;
margin-top: 0;
margin-bottom: 5px;
border-bottom: 1px solid black
  }

.container {
  background: white;
  padding: 20px;
  margin: 40px auto;
  width: 80%;
  border-radius: 10px;
}

input {
  width: 50px;
  padding: 6px;
  margin: 10px 0;
}

button {
  padding: 10px 20px;
  margin-top: 10px;
  cursor: pointer;
}

  .flex-container {
    display: flex;       /* Enables flexbox layout */
    gap: 10px;           /* Adds space between columns */
    width: 100%;         /* Full width of the page */
  }

  .flex-item {
    flex: 1;             /* Each item grows equally to fill 1/3 of the space */
    padding: 20px;
    background-color: #f0f0f0;
    border: 1px solid #ccc;
    text-align: center;
  }