diff --git a/README.md b/README.md
index f1842e6..3695acd 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,7 @@ Options:
   -n, --no-dim-when-only         Don't dim when switching to a workspace that only has one visible window
   -i, --ignore-entering-special  Don't dim when opening a special workspace
   -I, --ignore-leaving-special   Don't dim when closing a special workspace
+  -D, --dialog-dim [<STRENGTH>]  Dim windows if they're the same class and floating (strength_default: 0.7)
   -v, --verbose                  Show information about what hyprdim is doing
   -h, --help                     Print help (see more with '--help')
   -V, --version                  Print version
diff --git a/completions/_hyprdim b/completions/_hyprdim
index e3b0555..b2cbbe2 100644
--- a/completions/_hyprdim
+++ b/completions/_hyprdim
@@ -23,6 +23,8 @@ _hyprdim() {
 '--fade=[Fade animation speed from 0 (instantaneous) to 255 (very slow)]:FADE: ' \
 '-b+[Bezier curve used for the animation]:BEZIER: ' \
 '--bezier=[Bezier curve used for the animation]:BEZIER: ' \
+'-D+[Dim windows if they'\''re the same class and floating (strength_default\: 0.7)]' \
+'--dialog-dim=[Dim windows if they'\''re the same class and floating (strength_default\: 0.7)]' \
 '-p[Prevent dim_inactive from being disabled by \`hyprctl reload\` etc]' \
 '--persist[Prevent dim_inactive from being disabled by \`hyprctl reload\` etc]' \
 '-n[Don'\''t dim when switching to a workspace that only has one visible window]' \
diff --git a/completions/hyprdim.bash b/completions/hyprdim.bash
index c6912b1..9b31880 100644
--- a/completions/hyprdim.bash
+++ b/completions/hyprdim.bash
@@ -19,7 +19,7 @@ _hyprdim() {
 
     case "${cmd}" in
         hyprdim)
-            opts="-s -d -f -b -p -n -i -I -v -h -V --strength --duration --fade --bezier --persist --no-dim-when-only --ignore-entering-special --ignore-leaving-special --verbose --help --version"
+            opts="-s -d -f -b -p -n -i -I -D -v -h -V --strength --duration --fade --bezier --persist --no-dim-when-only --ignore-entering-special --ignore-leaving-special --dialog-dim --verbose --help --version"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -57,6 +57,14 @@ _hyprdim() {
                     COMPREPLY=($(compgen -f "${cur}"))
                     return 0
                     ;;
+                --dialog-dim)
+                    COMPREPLY=($(compgen -f "${cur}"))
+                    return 0
+                    ;;
+                -D)
+                    COMPREPLY=($(compgen -f "${cur}"))
+                    return 0
+                    ;;
                 *)
                     COMPREPLY=()
                     ;;
diff --git a/completions/hyprdim.fish b/completions/hyprdim.fish
index 2217ddb..6d2406f 100644
--- a/completions/hyprdim.fish
+++ b/completions/hyprdim.fish
@@ -2,6 +2,7 @@ complete -c hyprdim -s s -l strength -d 'A value from 0 (no dim) to 1 (maximum d
 complete -c hyprdim -s d -l duration -d 'How many milliseconds to wait before removing dim' -r
 complete -c hyprdim -s f -l fade -d 'Fade animation speed from 0 (instantaneous) to 255 (very slow)' -r
 complete -c hyprdim -s b -l bezier -d 'Bezier curve used for the animation' -r
+complete -c hyprdim -s D -l dialog-dim -d 'Dim windows if they\'re the same class and floating (strength_default: 0.7)' -r
 complete -c hyprdim -s p -l persist -d 'Prevent dim_inactive from being disabled by `hyprctl reload` etc'
 complete -c hyprdim -s n -l no-dim-when-only -d 'Don\'t dim when switching to a workspace that only has one visible window'
 complete -c hyprdim -s i -l ignore-entering-special -d 'Don\'t dim when opening a special workspace'
diff --git a/man/hyprdim.1 b/man/hyprdim.1
index 27a610f..fad998e 100644
--- a/man/hyprdim.1
+++ b/man/hyprdim.1
@@ -4,7 +4,7 @@
 .SH NAME
 hyprdim \- Automatically dim windows in Hyprland when switching between them.
 .SH SYNOPSIS
-\fBhyprdim\fR [\fB\-s\fR|\fB\-\-strength\fR] [\fB\-d\fR|\fB\-\-duration\fR] [\fB\-f\fR|\fB\-\-fade\fR] [\fB\-b\fR|\fB\-\-bezier\fR] [\fB\-p\fR|\fB\-\-persist\fR] [\fB\-n\fR|\fB\-\-no\-dim\-when\-only\fR] [\fB\-i\fR|\fB\-\-ignore\-entering\-special\fR] [\fB\-I\fR|\fB\-\-ignore\-leaving\-special\fR] [\fB\-v\fR|\fB\-\-verbose\fR] [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR] 
+\fBhyprdim\fR [\fB\-s\fR|\fB\-\-strength\fR] [\fB\-d\fR|\fB\-\-duration\fR] [\fB\-f\fR|\fB\-\-fade\fR] [\fB\-b\fR|\fB\-\-bezier\fR] [\fB\-p\fR|\fB\-\-persist\fR] [\fB\-n\fR|\fB\-\-no\-dim\-when\-only\fR] [\fB\-i\fR|\fB\-\-ignore\-entering\-special\fR] [\fB\-I\fR|\fB\-\-ignore\-leaving\-special\fR] [\fB\-D\fR|\fB\-\-dialog\-dim\fR] [\fB\-v\fR|\fB\-\-verbose\fR] [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR] 
 .SH DESCRIPTION
 .PP
 hyprdim is a daemon that automatically dims windows in Hyprland[1] when
@@ -74,6 +74,17 @@ Don\*(Aqt dim when closing a special workspace
 
 This is useful if you have multiple windows in your main workspace and usually don\*(Aqt switch between them.
 .TP
+\fB\-D\fR, \fB\-\-dialog\-dim\fR=\fISTRENGTH\fR
+Dim windows if they\*(Aqre the same class and floating (strength_default: 0.7)
+
+This option is particularly useful for dimming dialog boxes started by applications since those tend to have the same class and be floating.
+
+The dim is a permanent dim while working in the floating window of the same class.
+
+Note that the dim is removed when switching workspaces or doing any other event.
+
+Optionally specify a strength value to change how much dim is applied to dialog windows. The default strength value is 0.7.
+.TP
 \fB\-v\fR, \fB\-\-verbose\fR
 Show information about what hyprdim is doing
 .TP
diff --git a/src/cli.rs b/src/cli.rs
index 804897b..6cf4e86 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -91,6 +91,20 @@ pub struct Cli {
     #[arg(short = 'I', long, default_value_t = false)]
     pub ignore_leaving_special: bool,
 
+    /// Dim windows if they're the same class and floating (strength_default: 0.7)
+    ///
+    /// This option is particularly useful for dimming dialog boxes started by applications
+    /// since those tend to have the same class and be floating.
+    ///
+    /// The dim is a permanent dim while working in the floating window of the same class.
+    ///
+    /// Note that the dim is removed when switching workspaces or doing any other event.
+    ///
+    /// Optionally specify a strength value to change how much dim is applied to dialog windows.
+    /// The default strength value is 0.7.
+    #[arg(short = 'D', long, value_name = "STRENGTH", default_value = None, default_missing_value = "0.7", num_args = 0..=1)]
+    pub dialog_dim: Option<f64>,
+
     /// Show information about what hyprdim is doing
     #[arg(short, long, default_value_t = false)]
     pub verbose: bool,
diff --git a/src/lib.rs b/src/lib.rs
index 00d39f9..0ff2baf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,7 @@ pub fn log(text: &str) {
 /// enough, dimming is disabled.
 pub fn spawn_dim_thread(
     num_threads: Arc<Mutex<u16>>,
+    is_set_dim: Arc<Mutex<bool>>,
     strength: f64,
     persist: bool,
     duration: u64,
@@ -43,17 +44,33 @@ pub fn spawn_dim_thread(
         thread::sleep(time::Duration::from_millis(duration));
         *num_threads.lock().unwrap() -= 1;
 
-        // If this is the last thread, remove dim
+        // If this is the last thread and we're not setting dim, remove dim
         if *num_threads.lock().unwrap() == 0 {
-            Keyword::set("decoration:dim_strength", 0)?;
+            if *is_set_dim.lock().unwrap() {
+                log("info: Last thread, but not removing dim since permanent dim is active");
+            } else {
+                Keyword::set("decoration:dim_strength", 0)?;
 
-            log("info: Removed dim (last thread)");
+                log("info: Removed dim (last thread)");
+            }
         }
 
         Ok(())
     });
 }
 
+pub fn set_dim(strength: f64, persist: bool) -> hyprland::Result<()> {
+    if persist {
+        Keyword::set("decoration:dim_inactive", "yes")?;
+    };
+
+    Keyword::set("decoration:dim_strength", strength)?;
+
+    log("info: Set a permanent dim (until next event) without spawning thread");
+
+    Ok(())
+}
+
 /// Gets whether the current workspace is a special workspace or not.
 ///
 /// This function works by getting which workspace the active window is in.
@@ -89,3 +106,12 @@ pub fn special_only_has_one_visible_window() -> bool {
 
     false
 }
+
+pub fn is_floating() -> bool {
+    if let Some(client) = Client::get_active().unwrap() {
+        let Client { floating, .. } = client;
+        return floating;
+    }
+
+    false
+}
diff --git a/src/main.rs b/src/main.rs
index 4496aa5..bc7d679 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,9 @@
 use clap::Parser;
 use cli::Cli;
+use hyprdim::is_floating;
 use hyprdim::is_special;
 use hyprdim::log;
+use hyprdim::set_dim;
 use hyprdim::spawn_dim_thread;
 use hyprdim::special_only_has_one_visible_window;
 use hyprland::data::Workspace;
@@ -47,6 +49,7 @@ fn main() -> hyprland::Result<()> {
         no_dim_when_only,
         ignore_entering_special,
         ignore_leaving_special,
+        dialog_dim,
         ..
     } = Cli::parse();
 
@@ -58,6 +61,8 @@ fn main() -> hyprland::Result<()> {
     // Keep track of state
     let num_threads: Arc<Mutex<u16>> = Arc::new(Mutex::new(0));
     let last_address: Arc<Mutex<Option<Address>>> = Arc::new(Mutex::new(None));
+    let last_class: Arc<Mutex<Option<String>>> = Arc::new(Mutex::new(None));
+    let is_set_dim: Arc<Mutex<bool>> = Arc::new(Mutex::new(false));
     let in_special_workspace: Arc<Mutex<bool>> = Arc::new(Mutex::new(is_special()));
 
     // Initialize with dim so the user sees something, but only if the user wants dim
@@ -68,16 +73,17 @@ fn main() -> hyprland::Result<()> {
         Keyword::set("decoration:dim_strength", 0)?;
         Keyword::set("decoration:dim_inactive", "yes")?;
     } else {
-        spawn_dim_thread(num_threads.clone(), strength, persist, duration, true);
+        spawn_dim_thread(num_threads.clone(), is_set_dim.clone(), strength, persist, duration, true);
     }
 
     // On active window changes
     event_listener.add_active_window_change_handler(move |data| {
         // Ignore the event if no window_address was given
-        let Some(WindowEventData { window_address, .. }) = data else { return };
+        let Some(WindowEventData { window_address, window_class, .. }) = data else { return };
 
-        // Clone inside since u16 does not implement copy
+        // Clone inside since primitives don't implement copy
         let num_threads = num_threads.clone();
+        let is_set_dim = is_set_dim.clone();
 
         // If the last address is the same as the new window, don't dim
         if let Some(ref old_address) = *last_address.lock().unwrap() {
@@ -86,7 +92,16 @@ fn main() -> hyprland::Result<()> {
             }
         }
 
+        let mut same_class = false;
+
+        if let Some(ref old_class) = *last_class.lock().unwrap() {
+            if format!("{old_class}") == format!("{window_class}") {
+                same_class = true;
+            }
+        }
+
         *last_address.lock().unwrap() = Some(window_address.clone());
+        *last_class.lock().unwrap() = Some(window_class.clone());
 
         // Get the state of the current parent workspace
         let parent_workspace = Workspace::get_active().unwrap();
@@ -118,6 +133,16 @@ fn main() -> hyprland::Result<()> {
             }
         }
 
+        // Enable dim when using a floating windows with the same class as the last window,
+        // but only if the user specified the argument to do so.
+        if let Some(dialog_strength) = dialog_dim {
+            if same_class && is_floating() {
+                *is_set_dim.lock().unwrap() = true;
+                set_dim(dialog_strength, persist).unwrap();
+                return;
+            }
+        }
+
         // Don't dim when switching to another workspace with only one window
         if no_dim_when_only {
             if (parent_workspace.windows == 1 || parent_workspace.fullscreen)
@@ -133,7 +158,8 @@ fn main() -> hyprland::Result<()> {
             }
         }
 
-        spawn_dim_thread(num_threads, strength, persist, duration, false);
+        *is_set_dim.lock().unwrap() = false;
+        spawn_dim_thread(num_threads, is_set_dim, strength, persist, duration, false);
     });
 
     thread::spawn(move || -> hyprland::Result<()> {