ElectronMCLauncher/app/assets/css/styles.css

@font-face {
    font-family: ringbearer;
    src: url('../fonts/ringbearer.ttf');
}

body, html {
    margin: 0px;
    padding: 0px;
}

html {
    background: url(../images/BrownWithWignette.jpg) no-repeat center center fixed;
    background-size: cover;
}