diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index b2e793c..392235a 100644
Binary files a/.idea/caches/build_file_checksums.ser and b/.idea/caches/build_file_checksums.ser differ
diff --git a/.idea/caches/gradle_models.ser b/.idea/caches/gradle_models.ser
new file mode 100644
index 0000000..d2a4fd8
Binary files /dev/null and b/.idea/caches/gradle_models.ser differ
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index e399d5a..1f2b317 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -3,6 +3,9 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <compositeConfiguration>
+          <compositeBuild compositeDefinitionSource="SCRIPT" />
+        </compositeConfiguration>
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">
diff --git a/app/build.gradle b/app/build.gradle
index 4139dc0..84b50da 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,11 +1,11 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 27
     defaultConfig {
         applicationId "com.shaygan.datepicker"
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -21,7 +21,7 @@ android {
 dependencies {
     implementation project(':datepickerpersian')
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
diff --git a/app/src/main/java/com/shaygan/datepicker/MainActivity.java b/app/src/main/java/com/shaygan/datepicker/MainActivity.java
index 36ee181..0b44e6b 100644
--- a/app/src/main/java/com/shaygan/datepicker/MainActivity.java
+++ b/app/src/main/java/com/shaygan/datepicker/MainActivity.java
@@ -51,7 +51,7 @@ private void dateRangePicker() {
                 .setTabIndicatorColor(getResources().getColor(R.color.white))
                 .setWheelTextColor(getResources().getColor(R.color.white_smoke))
                 .setWheelTextColorSelected(getResources().getColor(R.color.white))
-                .setWheelTextSize(9)
+                .setWheelTextSize(20)
                 .setCornerRadius(40)
                 .setTypeface(face)
                 .setDoneText("تائید")
@@ -93,7 +93,7 @@ private void datePicker() {
                 .setTabIndicatorColor(getResources().getColor(R.color.white))
                 .setWheelTextColor(getResources().getColor(R.color.white_smoke))
                 .setWheelTextColorSelected(getResources().getColor(R.color.white))
-                .setWheelTextSize(9)
+                .setWheelTextSize(20)
                 .setCornerRadius(40)
                 .setTypeface(face)
                 .setDoneText("تائید")
diff --git a/datepickerpersian/build.gradle b/datepickerpersian/build.gradle
index c1afe69..4e22863 100644
--- a/datepickerpersian/build.gradle
+++ b/datepickerpersian/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 27
 
 
 
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
 
@@ -27,11 +27,11 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
-    implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
-    implementation 'com.android.support:design:28.0.0-rc01'
+    implementation 'com.android.support:design:27.1.1'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 }