diff --git a/app/src/main/res/drawable-nodpi/ic_cat_connectivity.png b/app/src/main/res/drawable-nodpi/ic_cat_connectivity.png
deleted file mode 100644
index 45e845092650091259b05298865a73e942020a9e..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_connectivity.png and /dev/null differ
diff --git a/app/src/main/res/drawable-nodpi/ic_cat_development.png b/app/src/main/res/drawable-nodpi/ic_cat_development.png
deleted file mode 100644
index 5e7ee0f77731af3587c3e6620625305a1102737c..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_development.png and /dev/null differ
diff --git a/app/src/main/res/drawable-nodpi/ic_cat_graphics.png b/app/src/main/res/drawable-nodpi/ic_cat_graphics.png
deleted file mode 100644
index ff1a5c463d9f82c308e5501f7480c1a6c1670054..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_graphics.png and /dev/null differ
diff --git a/app/src/main/res/drawable-nodpi/ic_cat_internet.png b/app/src/main/res/drawable-nodpi/ic_cat_internet.png
deleted file mode 100644
index 158d934e17d4816b6d4bf9b1b6d7a426bca55ba1..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_internet.png and /dev/null differ
diff --git a/app/src/main/res/drawable-nodpi/ic_cat_security.png b/app/src/main/res/drawable-nodpi/ic_cat_security.png
deleted file mode 100644
index 1ae2f9293884655c397ead694d5552094cd38ca7..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_security.png and /dev/null differ
diff --git a/app/src/main/res/drawable-nodpi/ic_cat_system.png b/app/src/main/res/drawable-nodpi/ic_cat_system.png
deleted file mode 100644
index 9456c1d804b97c3b7a26506f85fd672547586e67..0000000000000000000000000000000000000000
Binary files a/app/src/main/res/drawable-nodpi/ic_cat_system.png and /dev/null differ
diff --git a/app/src/main/res/drawable/ic_books_and_reference.xml b/app/src/main/res/drawable/ic_books_and_reference.xml
index 195c062205cc7f14e26896dc2026822dbff2c899..509e4be85e0cc4ecbe4c32a2c87d9d73b9e33d1a 100644
--- a/app/src/main/res/drawable/ic_books_and_reference.xml
+++ b/app/src/main/res/drawable/ic_books_and_reference.xml
@@ -1,39 +1,22 @@
-
-
+
+
-
+ android:fillColor="#0088ED"
+ android:pathData="M22.6857 26.4571H5.88574C5.34289 26.4571 4.88574 26 4.88574 25.4571V3.14285C4.88574 2.6 5.34289 2.14285 5.88574 2.14285H22.6857C23.2286 2.14285 23.6857 2.6 23.6857 3.14285V25.4571C23.6857 26 23.2286 26.4571 22.6857 26.4571ZM6.88574 24.4571H21.6857V4.14285H6.88574V24.4571Z" />
+ android:fillColor="#0088ED"
+ android:pathData="M26.1144 29.8571H9.31438C9.05724 29.8571 8.80009 29.7428 8.60009 29.5714L5.17152 26.1714C4.77152 25.7714 4.77152 25.1428 5.17152 24.7714C5.57152 24.3714 6.20009 24.3714 6.57152 24.7714L9.74295 27.8571H25.1144V7.54285H22.6858C22.143 7.54285 21.6858 7.0857 21.6858 6.54285C21.6858 5.99999 22.143 5.54285 22.6858 5.54285H26.1144C26.6572 5.54285 27.1144 5.99999 27.1144 6.54285V28.8571C27.1144 29.4 26.6572 29.8571 26.1144 29.8571Z" />
+ android:fillColor="#0088ED"
+ android:pathData="M16.8002 10.6286H11.7716C11.2287 10.6286 10.7716 10.1714 10.7716 9.62857C10.7716 9.08571 11.2287 8.62857 11.7716 8.62857H16.8002C17.343 8.62857 17.8002 9.08571 17.8002 9.62857C17.8002 10.1714 17.343 10.6286 16.8002 10.6286Z" />
+ android:fillColor="#0088ED"
+ android:pathData="M16.8002 14.2H11.7716C11.2287 14.2 10.7716 13.7429 10.7716 13.2C10.7716 12.6571 11.2287 12.2 11.7716 12.2H16.8002C17.343 12.2 17.8002 12.6571 17.8002 13.2C17.8002 13.7429 17.343 14.2 16.8002 14.2Z" />
diff --git a/app/src/main/res/drawable/ic_cat_connectivity.xml b/app/src/main/res/drawable/ic_cat_connectivity.xml
new file mode 100644
index 0000000000000000000000000000000000000000..0a777dae6460bfba3c1f0e59adf9ed3c8ad6726e
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_connectivity.xml
@@ -0,0 +1,12 @@
+
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_default.xml b/app/src/main/res/drawable/ic_cat_default.xml
index c9b9a0d9644c91c17551b0c41bcb59c4dcc1c082..be76fbd84aec91ab21c3e5c3268b83428bdd5856 100644
--- a/app/src/main/res/drawable/ic_cat_default.xml
+++ b/app/src/main/res/drawable/ic_cat_default.xml
@@ -1,21 +1,25 @@
-
-
-
-
-
-
-
+
+
+
+
+
+
+
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_development.xml b/app/src/main/res/drawable/ic_cat_development.xml
new file mode 100644
index 0000000000000000000000000000000000000000..784ba4d3116517a5103cde527970125b0e03f9fe
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_development.xml
@@ -0,0 +1,19 @@
+
+
+
+
+
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_graphics.xml b/app/src/main/res/drawable/ic_cat_graphics.xml
new file mode 100644
index 0000000000000000000000000000000000000000..9939374666902f2a6d827433e40a44f811d7071c
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_graphics.xml
@@ -0,0 +1,9 @@
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_health_and_fitness.xml b/app/src/main/res/drawable/ic_cat_health_and_fitness.xml
index bcecf7d02f36369b934bfb692cc3536e2c4d524a..12198be030f2561b8075a9fc4fc05801b4534862 100644
--- a/app/src/main/res/drawable/ic_cat_health_and_fitness.xml
+++ b/app/src/main/res/drawable/ic_cat_health_and_fitness.xml
@@ -1,27 +1,9 @@
-
-
-
-
-
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_house_and_home.xml b/app/src/main/res/drawable/ic_cat_house_and_home.xml
index c14b0c5659e4bc740834e60593acc7bbc57b27f3..8e429cfff53509e0bae8f63a7ffd5404f976abd2 100644
--- a/app/src/main/res/drawable/ic_cat_house_and_home.xml
+++ b/app/src/main/res/drawable/ic_cat_house_and_home.xml
@@ -1,27 +1,22 @@
-
-
-
-
-
+
+
+
+
+
+
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_internet.xml b/app/src/main/res/drawable/ic_cat_internet.xml
new file mode 100644
index 0000000000000000000000000000000000000000..d110f3d342eff7eddd16d03fce6434aee8d112a1
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_internet.xml
@@ -0,0 +1,9 @@
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_security.xml b/app/src/main/res/drawable/ic_cat_security.xml
new file mode 100644
index 0000000000000000000000000000000000000000..e17f9e6f2e8d6531c021cf44c5af5da3be1de6a3
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_security.xml
@@ -0,0 +1,15 @@
+
+
+
+
diff --git a/app/src/main/res/drawable/ic_cat_system.xml b/app/src/main/res/drawable/ic_cat_system.xml
new file mode 100644
index 0000000000000000000000000000000000000000..bdd9b11aed2ad72f4804b20467db8a9fda8b7d7e
--- /dev/null
+++ b/app/src/main/res/drawable/ic_cat_system.xml
@@ -0,0 +1,12 @@
+
+
+
+