index.css

body {
    background-image: url("https://www.lionsroar.com/wp-content/uploads/2023/08/bamboo.jpg");
    background-size: cover;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: bold;
    text-align: center;
    color: black;
}

#greeting {
  font-size: 1em;
  margin-top: 20px;
  color: gray
}

.container {
    background: lightcyan;
    max-width: 80%;
    margin: auto;
    border: 3px solid black;
    border-radius: 10px;
}

h1 {
    margin-top: 10px;
    margin-bottom: 10px;
}

h2 {
    font-size: 50px;
    margin-top: 0;
    margin-bottom: 20px;
}

button {
    border: 1px solid black;
    padding-top: 10px;
    padding-bottom: 10px;
    color: white;
    font-weight: bold;
    width: 200px;
    margin-bottom: 5px;
    border-radius: 5px;
}

#increment-btn {
    background: lightseagreen;
}

#save-btn {
    background: lightslategray;
}