Create a theme out of my page

sass/style.scss

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+@charset "utf-8";
+@import "../vendor/bulma/bulma.sass";
+
+html, .navbar, .footer {
+    background-color: $light;
+}
+
+.footer {
+    padding-bottom: 0;
+}
+
+@media (prefers-color-scheme: dark) {
+    html, .navbar, .footer, p, strong, .title, li {
+        background-color: $dark;
+        color: $white;
+    }
+
+    .subtitle, a:hover {
+        color: $light;
+    }
+
+    a {
+        color: hsl(217, 71%, 70%);
+    }
+
+    .lightbox a.delete {
+        color: $light;
+    }
+}
+
+.lightbox {
+    opacity: 0;
+    z-index: 900;
+    position: fixed;
+    transition: opacity 0.2s linear;
+    height: 100%;
+    width: 100%;
+    background-color: rgba($black, 0.5);
+    top: 0;
+    left: 0;
+    pointer-events: none;
+    @supports ((-webkit-backdrop-filter: none) or (backdrop-filter: none)) {
+            -webkit-backdrop-filter: blur(5px);
+            backdrop-filter: blur(5px);
+    }
+}
+
+.lightbox span.spacer {
+    display: inline-block;
+    height: 100%;
+    vertical-align: middle;
+}
+
+.lightbox img {
+    display: inline-block;
+    box-shadow: 0 0 20px $black;
+    max-width: 90%;
+    max-height: 90%;
+    width: auto;
+    vertical-align: middle;
+    @include touch {
+        margin-top: 35px;
+        max-height: 80%;
+    }
+}
+
+.lightbox a {
+    font-size: $size-1;
+    color: $light;
+    z-index: 900;
+    @include touch {
+        height: 100%;
+        width: 50%;
+        font-size: $size-3;
+    }
+}
+
+.lightbox a.lightbox-nav-previous {
+    z-index: 900;
+    @include touch {
+        position: absolute;
+        left: 0%;
+        font-size: $size-3;
+    }
+}
+
+.lightbox a.lightbox-nav-next {
+    z-index: 900;
+    @include touch {
+        position: absolute;
+        left: 50%;
+    }
+}
+
+.lightbox a.close {
+    display: block;
+    height: 100%;
+    width: 100%;
+    z-index: 999;
+}
+
+.lightbox a.delete {
+    z-index: 999;
+    position: fixed;
+    top: 1%;
+    right: 1%;
+}
+
+.lightbox:target {
+    opacity: 1;
+    pointer-events: auto;
+}
+
+.lightbox-previous {
+    position: absolute;
+    height: 100%;
+    width: 50%;
+    top: 0%;
+    left: 0%;
+}
+
+.lightbox-next {
+    position: absolute;
+    height: 100%;
+    width: 50%;
+    top: 0%;
+    left: 50%;
+}
+
+.gallery {
+    gap: $gap / 4;
+}
+
+.thumbnail {
+    width: 120px;
+    height: 120px;
+    vertical-align: middle;
+    transition: transform .2s;
+}
+
+.thumbnail:hover {
+    transform: scale(1.1);
+}
+
+.isso-postbox .form-wrapper .textarea-wrapper .textarea {
+    overflow-y: auto;
+}