style.css

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    font-family: 'Calibri', sans-serif;
}

canvas {
    background-color: black;
    display: block;
}

:fullscreen canvas {
    width: 100vw;
    max-height: 90vh;
}

:fullscreen #fullscreen-button {
    display: none;
}

img {
    width: 720px;
    height: 480px;
}

#start-container {
    position: relative;
}

#canvas-container {
    position: relative;
}

#start-button {
    left: 50%;
    top: 50px;
    transform: translateX(-50%);
}

#restart-button {
    bottom: 16px;
    right: 16px
}

#fullscreen-button {
    height: 20px;
    width: 20px;
    object-fit: contain;
    cursor: pointer;
    position: absolute;
    right: 5px;
    top:5px;
}

.button {
    z-index: 1;
    position: absolute;
    background-color: #FFA100;
    font-size: 50px;
    cursor: pointer;
    transition: all 250ms ease-in-out;
    border: 1px solid black
}

.button:hover {
    background-color: #FFDF00;
}

#controls {
    color: white;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    bottom: 0;
    left: 10px;
    right: 200px;
    z-index: 1;
}

#controls img {
    height: 20px;
    width: 20px;
    object-fit: contain;
}

.control-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (max-width: 720px) {
    canvas {
        width: 100%;
    }

    #start-container img {
        width: 100%;
    }
}

@media (max-height: 480px) {
    canvas {
        height: 100vh;
    }

    #start-container img {
        height: 100vh;
    }

    #start-button {
        top: 32px
    }

    h1 {
        display: none;
    }
}

.d-none {
    display: none !important;
}