index.css

body {
    background-color: pink;
    background-size: cover;
    font-family: Ubuntu, Roboto, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-weight: bold;
    text-align: center;
}

.container {
    background: white;
    opacity: 85%;
    max-width: 80%;
    margin: auto;
    border: 3px solid pink;
    border-radius: 20px;
}

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

h2 {
    font-size: 80px;
    margin-top: 0;
    margin-bottom: 20px;
}

button {
    border: none;
    padding-top: 10px;
    padding-bottom: 10px;
    color: white;
    font-weight: lighter;
    width: 220px;
    margin-bottom: 5px;
    border-radius: 5px;
}

#increment-btn {
    background: darkslateblue;
}

#save-btn {
    background: darkseagreen;
}