style.css

* {
    box-sizing: border-box;
}

body {
    background-color: #df9115;
    color: #FFF;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    min-height: 75vh;
    margin: 0;
}

h1 {
    margin-bottom: 0;
    margin-top: 0;
}

h2 {
    margin-top: 0;
    margin-bottom: 0;
}

#canvas {
    /* background: #c3d5b6; */
    border-radius: 5px;
    background-image: url(https://images.unsplash.com/photo-1543852786-1cf6624b9987?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=634&q=80);
    background-repeat: no-repeat;
    background-size: cover;
}

#paddleOneSource {
    display: none;
}

#paddleTwoSource {
    display: none;
}

#ball {
    border-radius: 50%;
    display: none;
}