* {
    margin: 0;
    box-sizing: border-box;
}

html {
    width: 100%;
    height: 100%;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    color: lightyellow;
    font-size: 10px;
    line-height: 1.25;
    -webkit-text-size-adjust: 100%; /* Prevents Safari from auto-resizing text. */
    background-color: #556B2F;
    background-image: url('moss.jpg');
    }
    text-align: center;

    /* Vertically and horizontally centers #wrapper */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;

}

img {
    width: 100%;
}

.toggle {
    background: black;
    color: white;
}

.toggle.clicked {
    background: yellow;
    color: black;
}