diff --git a/screenshot/cpu_mac.png b/screenshot/cpu_mac.png
index d40a324..78afb2c 100644
Binary files a/screenshot/cpu_mac.png and b/screenshot/cpu_mac.png differ
diff --git a/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.form b/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.form
index 55d816f..c843346 100644
--- a/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.form
+++ b/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.form
@@ -37,7 +37,7 @@
                 <border type="none"/>
                 <children>
                   <grid id="a9c92" layout-manager="GridLayoutManager" row-count="5" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
-                    <margin top="0" left="0" bottom="0" right="0"/>
+                    <margin top="8" left="0" bottom="0" right="0"/>
                     <constraints/>
                     <properties/>
                     <border type="none"/>
diff --git a/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.java b/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.java
index 38b9cd1..c6801dd 100644
--- a/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.java
+++ b/src/main/java/com/luoboduner/moo/info/ui/form/CpuForm.java
@@ -346,7 +346,7 @@ public class CpuForm {
      */
     private static double cpuData(CentralProcessor proc) {
         if (prevTicks == null) {
-            prevTicks = proc.getSystemCpuLoadTicks();
+            return 0;
         }
         double d = proc.getSystemCpuLoadBetweenTicks(prevTicks);
         return d;
@@ -380,7 +380,7 @@ public class CpuForm {
         scrollPaneLeft = new JScrollPane();
         panel2.add(scrollPaneLeft, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_WANT_GROW, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_WANT_GROW, null, null, null, 0, false));
         final JPanel panel3 = new JPanel();
-        panel3.setLayout(new GridLayoutManager(5, 1, new Insets(0, 0, 0, 0), -1, -1));
+        panel3.setLayout(new GridLayoutManager(5, 1, new Insets(8, 0, 0, 0), -1, -1));
         scrollPaneLeft.setViewportView(panel3);
         scuPanel = new JPanel();
         scuPanel.setLayout(new GridLayoutManager(2, 1, new Insets(10, 10, 10, 10), -1, -1));