hexo-theme-maxmilu/source/css/_partial/background.styl

A fork hexo theme base hexo-theme-nexmoe.

#nexmoe-background {
    .nexmoe-bg {
        opacity: 0.2;
        background-size: cover;
        filter: blur(30px);
        height: 100vh;
        width: 100%;
        position: fixed;
        top: 0;
        left: 0;
        z-index: -1;
    }

    .mdui-appbar {
        padding: 10px;
        display: none;

        img {
            width: 100%;
        }
    }
}
@media screen and (max-width: 1023px) {
    #nexmoe-background {
        .mdui-appbar {
            display: block !important;
        }
    }
}