phantop.github.io/assets/css/style.css

html {
    min-height: 100%
}

body {
    background: repeating-linear-gradient(to bottom,
    #5bcefa 000px, #5bcefa 150px,
    #f5a9b8 150px, #f5a9b8 300px, 
    #ffffff 300px, #ffffff 450px,
    #f5a9b8 450px, #f5a9b8 600px);
}

a { color: rgba(0, 0, 0, 0.7); }
a:focus, a:hover { color: rgba(0, 0, 0, 0.6); }

body > div{
    background-color: #fafafa;
    border-radius: 20px;
    border-style: dashed;
    color: #333;
    margin: auto;
    max-width: 800px;
    overflow: auto;
    padding: 20px;
}

@media (prefers-color-scheme: dark) {
    body {
        background: repeating-linear-gradient(to bottom,
        #D70071 000px, #D70071 300px,
        #9C4E97 300px, #9C4E97 450px, 
        #0035AA 450px, #0035AA 750px);
    }

    a { color: rgba(255, 255, 255, 0.8); }
    a:focus, a:hover { color: rgba(255, 255, 255, 0.6); }

    body > div { background-color: #050505; color: #FFF; }
}