diff --git a/src/functions/base.rs b/src/functions/base.rs
index 689213b..7969f29 100755
--- a/src/functions/base.rs
+++ b/src/functions/base.rs
@@ -1,5 +1,6 @@
 use crate::internal::exec::*;
 use crate::internal::*;
+use crate::internal::files::append_file;
 use std::path::PathBuf;
 
 pub fn install_base_packages() {
@@ -38,7 +39,7 @@ pub fn genfstab() {
 }
 
 pub fn install_bootloader_efi(efidir: PathBuf) {
-    install::install(vec!["grub", "efibootmgr", "grub-btrfs"]);
+    install::install(vec!["grub", "efibootmgr", "grub-btrfs", "crystal-grub-theme"]);
     let efidir = std::path::Path::new("/mnt").join(efidir);
     let efi_str = efidir.to_str().unwrap();
     if !std::path::Path::new(&format!("/mnt{efi_str}")).exists() {
@@ -67,6 +68,10 @@ pub fn install_bootloader_efi(efidir: PathBuf) {
         ),
         "install grub as efi without --removable",
     );
+    files_eval(
+        append_file("/mnt/etc/default/grub", "GRUB_THEME=\"/usr/share/grub/themes/crystal/theme.txt\""),
+        "enable crystal grub theme"
+    );
     exec_eval(
         exec_chroot(
             "grub-mkconfig",
@@ -77,7 +82,7 @@ pub fn install_bootloader_efi(efidir: PathBuf) {
 }
 
 pub fn install_bootloader_legacy(device: PathBuf) {
-    install::install(vec!["grub", "grub-btrfs"]);
+    install::install(vec!["grub", "grub-btrfs", "crystal-grub-theme"]);
     if !device.exists() {
         crash(format!("The device {device:?} does not exist"), 1);
     }
@@ -89,6 +94,10 @@ pub fn install_bootloader_legacy(device: PathBuf) {
         ),
         "install grub as legacy",
     );
+    files_eval(
+        append_file("/mnt/etc/default/grub", "GRUB_THEME=\"/usr/share/grub/themes/crystal/theme.txt\""),
+        "enable crystal grub theme"
+    );
     exec_eval(
         exec_chroot(
             "grub-mkconfig",