html,
body {
    background-color: black;
    opacity: 100%;
    margin: 0;
    padding: 0;
}

body {
    height: 100vh;
    width: 100vw;
}

* {
    box-sizing: border-box;
}

.background {
    height: 100%;
    width: 100%;
    opacity: 60%;
    background-image: linear-gradient(135deg, rgb(255, 170, 0) 0%, rgb(255, 38, 0) 100%);
}