Update 1

swaync/colors.css

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+@define-color bg0 #1d2021;
+@define-color bg1 #282828;
+@define-color bg2 #3c3838;
+@define-color bg3 #504945;
+@define-color bg4 #665c54;
+
+@define-color fg #ebdbb2;
+
+@define-color red #cc241d;
+@define-color orange #d65d0e;
+@define-color yellow #d79921;
+@define-color green #98971a;
+@define-color aqua #689d6a;
+@define-color blue #458588;
+@define-color purple #b16286;
+
+@define-color grey0 #a89984;
+@define-color grey1 #928374;
+@define-color grey2 #7c6e75;

swaync/config.json

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+{
+  "$schema": "/etc/xdg/swaync/configSchema.json",
+  "positionX": "right",
+  "positionY": "top",
+  "cssPriority": "user",
+
+  "control-center-width": 380,
+  "control-center-height": 860,
+  "control-center-margin-top": 2,
+  "control-center-margin-bottom": 2,
+  "control-center-margin-right": 1,
+  "control-center-margin-left": 0,
+
+  "notification-window-width": 400,
+  "notification-icon-size": 48,
+  "notification-body-image-height": 160,
+  "notification-body-image-width": 200,
+
+  "timeout": 4,
+  "timeout-low": 2,
+  "timeout-critical": 6,
+
+  "fit-to-screen": false,
+  "keyboard-shortcuts": true,
+  "image-visibility": "when-available",
+  "transition-time": 200,
+  "hide-on-clear": false,
+  "hide-on-action": false,
+  "script-fail-notify": true,
+  "scripts": {
+    "example-script": {
+      "exec": "echo 'Do something...'",
+      "urgency": "Normal"
+    }
+  },
+  "notification-visibility": {
+    "example-name": {
+      "state": "muted",
+      "urgency": "Low",
+      "app-name": "Spotify"
+    }
+  },
+  "widgets": [
+    "label",
+    "buttons-grid",
+    "mpris",
+    "title",
+    "dnd",
+    "notifications"
+  ],
+  "widget-config": {
+    "title": {
+      "text": "Notifications",
+      "clear-all-button": true,
+      "button-text": " 󰎟 "
+    },
+    "dnd": {
+      "text": "Do not disturb"
+    },
+    "label": {
+      "max-lines": 1,
+      "text": " "
+    },
+    "mpris": {
+      "image-size": 96,
+      "image-radius": 12
+    },
+    "volume": {
+      "label": "󰕾",
+      "show-per-app": true
+    },
+    "buttons-grid": {
+      "actions": [
+        {
+          "label": " ",
+          "command": "amixer set Master toggle"
+        },
+        {
+          "label": "",
+          "command": "amixer set Capture toggle"
+        },
+        {
+          "label": " ",
+          "command": "nm-connection-editor"
+        },
+        {
+          "label": "󰂯",
+          "command": "blueman-manager"
+        },
+        {
+          "label": "󰏘",
+          "command": "nwg-look"
+        }
+      ]
+    }
+  }
+}

swaync/style.css

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+@import "colors.css";
+@import "themes/nova-dark/notifications.css";
+@import "themes/nova-dark/central_control.css";

swaync/themes/nova-dark/central_control.css

@@ -0,0 +1,291 @@
+@define-color text            @fg;
+@define-color background-alt  @bg1
+@define-color background      @bg0;
+@define-color selected        @green;
+@define-color hover           alpha(@green, .4);
+@define-color urgent          @red;
+
+* {
+    color: @text;
+
+    all: unset;
+    font-size: 14px;
+    font-family: "Rubik", "JetBrains Mono Nerd Font Propo";
+    transition: 200ms;
+}
+
+/* Avoid 'annoying' backgroud */
+.blank-window {
+    background: transparent;
+}
+
+/* CONTROL CENTER ------------------------------------------------------------------------ */
+
+.control-center {
+    background: alpha(@background, 0.55);
+    border-radius: 24px;
+    border: 1px solid @selected;
+    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.6);
+    margin: 18px;
+    padding: 12px;
+}
+
+/* Notifications  */
+.control-center .notification-row .notification-background,
+.control-center
+    .notification-row
+    .notification-background
+    .notification.critical {
+    background-color: @background-alt;
+    border-radius: 16px;
+    margin: 4px 0px;
+    padding: 4px;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification.critical {
+    color: @urgent;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification
+    .notification-content {
+    margin: 6px;
+    padding: 8px 6px 2px 2px;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > * {
+    min-height: 3.4em;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action {
+    background: alpha(@selected, 0.6);
+    color: @text;
+    border-radius: 12px;
+    margin: 6px;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action:hover {
+    background: @selected;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action:active {
+    background-color: @selected;
+}
+
+/* Buttons */
+
+.control-center .notification-row .notification-background .close-button {
+    background: transparent;
+    border-radius: 6px;
+    color: @text;
+    margin: 0px;
+    padding: 4px;
+}
+
+.control-center .notification-row .notification-background .close-button:hover {
+    background-color: @selected;
+}
+
+.control-center
+    .notification-row
+    .notification-background
+    .close-button:active {
+    background-color: @selected;
+}
+
+progressbar,
+progress,
+trough {
+    border-radius: 12px;
+}
+
+progressbar {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+/* Notifications expanded-group */
+
+.notification-group {
+    margin: 2px 8px 2px 8px;
+}
+.notification-group-headers {
+    font-weight: bold;
+    font-size: 1.25rem;
+    color: @text;
+    letter-spacing: 2px;
+}
+
+.notification-group-icon {
+    color: @text;
+}
+
+.notification-group-collapse-button,
+.notification-group-close-all-button {
+    background: transparent;
+    color: @text;
+    margin: 4px;
+    border-radius: 6px;
+    padding: 4px;
+}
+
+.notification-group-collapse-button:hover,
+.notification-group-close-all-button:hover {
+    background: @hover;
+}
+
+/* WIDGETS --------------------------------------------------------------------------- */
+
+/* Notification clear button */
+.widget-title {
+    font-size: 1.2em;
+    margin: 6px;
+}
+
+.widget-title button {
+    background: @background-alt;
+    border-radius: 6px;
+    padding: 4px 16px;
+}
+
+.widget-title button:hover {
+    background-color: @hover;
+}
+
+.widget-title button:active {
+    background-color: @selected;
+}
+
+/* Do not disturb */
+.widget-dnd {
+    margin: 6px;
+    font-size: 1.2rem;
+}
+
+.widget-dnd > switch {
+    background: @background-alt;
+    font-size: initial;
+    border-radius: 8px;
+    box-shadow: none;
+    padding: 2px;
+}
+
+.widget-dnd > switch:hover {
+    background: @hover;
+}
+
+.widget-dnd > switch:checked {
+    background: @selected;
+}
+
+.widget-dnd > switch:checked:hover {
+    background: @hover;
+}
+
+.widget-dnd > switch slider {
+    background: @text;
+    border-radius: 6px;
+}
+
+/* Buttons menu */
+.widget-buttons-grid {
+    font-size: x-large;
+    padding: 6px 2px;
+    margin: 6px;
+    border-radius: 12px;
+    background: @background-alt;
+}
+
+.widget-buttons-grid > flowbox > flowboxchild > button {
+    margin: 4px 10px;
+    padding: 6px 12px;
+    background: transparent;
+    border-radius: 8px;
+}
+
+.widget-buttons-grid > flowbox > flowboxchild > button:hover {
+    background: @hover;
+}
+
+/* Music player */
+.widget-mpris {
+    background: @background-alt;
+    border-radius: 16px;
+    color: @text;
+    margin: 20px 6px;
+}
+
+/* NOTE: Background need *opacity 1* otherwise will turn into the album art blurred  */
+.widget-mpris-player {
+    background-color: @background;
+    border-radius: 22px;
+    padding: 6px 14px;
+    margin: 6px;
+}
+
+.widget-mpris > box > button {
+    color: @text;
+    border-radius: 20px;
+}
+
+.widget-mpris button {
+    color: alpha(@text, 0.6);
+}
+
+.widget-mpris button:hover {
+    color: @text;
+}
+
+.widget-mpris-album-art {
+    border-radius: 16px;
+}
+
+.widget-mpris-title {
+    font-weight: 700;
+    font-size: 1rem;
+}
+
+.widget-mpris-subtitle {
+    font-weight: 500;
+    font-size: 0.8rem;
+}
+
+picture.mpris-background {
+    opacity: 0;
+}
+
+/* Volume */
+.widget-volume {
+    background: @background;
+    color: @background;
+    padding: 4px;
+    margin: 6px;
+    border-radius: 6px;
+}

swaync/themes/nova-dark/notifications.css

@@ -0,0 +1,151 @@
+@define-color text            @fg;
+@define-color background-alt  @bg1;
+@define-color background      @bg0;
+@define-color selected        @green;
+@define-color hover           @bg2;
+@define-color urgent          @red;
+
+* {
+    /*background-alt:        @color1;      Buttons background */
+    /*selected:              @color2;      Button selected */
+    /*hover:                 @color5;      Hover button */
+    /*urgent:                @color6;      Urgency critical */
+    /*text-selected:         @background; */
+
+    color: @text;
+
+    all: unset;
+    font-size: 14px;
+    font-family: "Rubik", "JetBrains Mono Nerd Font Propo";
+    transition: 200ms;
+}
+
+.notification-row {
+    outline: none;
+    margin: 0;
+    padding: 0px;
+}
+
+.floating-notifications.background .notification-row .notification-background {
+    background: alpha(@background, 0.55);
+    box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.6);
+    border: 1px solid @selected;
+    border-radius: 24px;
+    margin: 16px;
+    padding: 0;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification {
+    padding: 6px;
+    border-radius: 12px;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification.critical {
+    border: 2px solid @urgent;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification
+    .notification-content {
+    margin: 14px;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > * {
+    min-height: 3.4em;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action {
+    border-radius: 8px;
+    background-color: @background-alt;
+    margin: 6px;
+    border: 1px solid transparent;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action:hover {
+    background-color: @hover;
+    border: 1px solid @selected;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .notification
+    > *:last-child
+    > *
+    .notification-action:active {
+    background-color: @selected;
+    color: @background;
+}
+
+.image {
+    margin: 10px 20px 10px 0px;
+}
+
+.summary {
+    font-weight: 800;
+    font-size: 1rem;
+}
+
+.body {
+    font-size: 0.8rem;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .close-button {
+    margin: 6px;
+    padding: 2px;
+    border-radius: 6px;
+    background-color: transparent;
+    border: 1px solid transparent;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .close-button:hover {
+    background-color: @selected;
+}
+
+.floating-notifications.background
+    .notification-row
+    .notification-background
+    .close-button:active {
+    background-color: @selected;
+    color: @background;
+}
+
+.notification.critical progress {
+    background-color: @selected;
+}
+
+.notification.low progress,
+.notification.normal progress {
+    background-color: @selected;
+}