index.css

body {
    background-image: url("https://media.istockphoto.com/id/1152782421/photo/unsatisfied-african-woman-showing-thumb-down-disapproval-gesture.jpg?s=612x612&w=0&k=20&c=BDBQJYwSOdtDnZq0nYgiXB0bLVfuBkGYbuK32G0QQl4=");
    background-size: cover;
    font-family: 'Open Sans', 'Helvetica Neue', sans-serif;
    text-align: center;
    height: 100vh;
}

.container {
    /* background-image: url("https://media.istockphoto.com/id/1152782421/photo/unsatisfied-african-woman-showing-thumb-down-disapproval-gesture.jpg?s=612x612&w=0&k=20&c=BDBQJYwSOdtDnZq0nYgiXB0bLVfuBkGYbuK32G0QQl4=");
    background-size: cover; */
    background: transparent;
    max-width: 80%;
    height: 100vh;
    margin: auto;
    border: 3px solid black;
    color: aqua;
    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: #2C2891;
}

#save-btn {
    background: #1C7947;
}

#save-el {
    font-weight: bold;
}