diff --git a/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj b/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
index 991d71c..85f38cd 100644
--- a/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
+++ b/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
@@ -196,6 +196,7 @@
     <Compile Include="Excel\Drawings\Style\XLDrawingSize.cs" />
     <Compile Include="Excel\Drawings\Style\XLDrawingStyle.cs" />
     <Compile Include="Excel\Drawings\Style\XLDrawingWeb.cs" />
+    <Compile Include="Excel\Style\Dictionary.cs" />
     <Compile Include="Excel\Style\IXLNumberFormatBase.cs" />
     <Compile Include="Excel\XLWorkbook_Save.NestedTypes.cs" />
     <Compile Include="Excel\CustomProperties\XLCustomProperties.cs" />
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Style/Dictionary.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/Dictionary.cs
new file mode 100644
index 0000000..b866775
--- /dev/null
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/Dictionary.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ClosedXML.Excel.Style
+{
+    class Dictionary
+    {
+    }
+}
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Style/IXLBorder.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/IXLBorder.cs
index 5656674..301867a 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Style/IXLBorder.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/IXLBorder.cs
@@ -23,6 +23,8 @@
     {
         XLBorderStyleValues OutsideBorder { set; }
         IXLColor OutsideBorderColor { set; }
+        XLBorderStyleValues InsideBorder { set; }
+        IXLColor InsideBorderColor { set; }
 
         XLBorderStyleValues LeftBorder { get; set; }
         IXLColor LeftBorderColor { get; set; }
@@ -39,6 +41,8 @@
 
         IXLStyle SetOutsideBorder(XLBorderStyleValues value);
         IXLStyle SetOutsideBorderColor(IXLColor value);
+        IXLStyle SetInsideBorder(XLBorderStyleValues value);
+        IXLStyle SetInsideBorderColor(IXLColor value);
 
         IXLStyle SetLeftBorder(XLBorderStyleValues value);
         IXLStyle SetLeftBorderColor(IXLColor value);
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Style/XLBorder.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/XLBorder.cs
index 839b9e0..82c924d 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Style/XLBorder.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Style/XLBorder.cs
@@ -3,6 +3,8 @@
 
 namespace ClosedXML.Excel
 {
+    using System.Collections.Generic;
+
     internal class XLBorder : IXLBorder
     {
         private readonly IXLStylized _container;
@@ -76,6 +78,66 @@
             }
         }
 
+        public XLBorderStyleValues InsideBorder
+        {
+            set
+            {
+                if (_container == null || _container.UpdatingStyle) return;
+
+                foreach (IXLRange r in _container.RangesUsed)
+                {
+                    Dictionary<Int32, XLBorderStyleValues> topBorders = new Dictionary<int, XLBorderStyleValues>();
+                    r.FirstRow().Cells().ForEach(c=>topBorders.Add(c.Address.ColumnNumber - r.RangeAddress.FirstAddress.ColumnNumber + 1, c.Style.Border.TopBorder));
+
+                    Dictionary<Int32, XLBorderStyleValues> bottomBorders = new Dictionary<int, XLBorderStyleValues>();
+                    r.LastRow().Cells().ForEach(c => bottomBorders.Add(c.Address.ColumnNumber - r.RangeAddress.FirstAddress.ColumnNumber + 1, c.Style.Border.BottomBorder));
+
+                    Dictionary<Int32, XLBorderStyleValues> leftBorders = new Dictionary<int, XLBorderStyleValues>();
+                    r.FirstColumn().Cells().ForEach(c => leftBorders.Add(c.Address.RowNumber - r.RangeAddress.FirstAddress.RowNumber + 1, c.Style.Border.LeftBorder));
+                    
+                    Dictionary<Int32, XLBorderStyleValues> rightBorders = new Dictionary<int, XLBorderStyleValues>();
+                    r.LastColumn().Cells().ForEach(c => rightBorders.Add(c.Address.RowNumber - r.RangeAddress.FirstAddress.RowNumber + 1, c.Style.Border.RightBorder));
+
+                    r.Cells().Style.Border.OutsideBorder = value;
+
+                    topBorders.ForEach(kp => r.FirstRow().Cell(kp.Key).Style.Border.TopBorder = kp.Value);
+                    bottomBorders.ForEach(kp => r.LastRow().Cell(kp.Key).Style.Border.BottomBorder = kp.Value);
+                    leftBorders.ForEach(kp => r.FirstColumn().Cell(kp.Key).Style.Border.LeftBorder = kp.Value);
+                    rightBorders.ForEach(kp => r.LastColumn().Cell(kp.Key).Style.Border.RightBorder = kp.Value);
+                }
+            }
+        }
+
+        public IXLColor InsideBorderColor
+        {
+            set
+            {
+                if (_container == null || _container.UpdatingStyle) return;
+
+                foreach (IXLRange r in _container.RangesUsed)
+                {
+                    Dictionary<Int32, IXLColor> topBorders = new Dictionary<int, IXLColor>();
+                    r.FirstRow().Cells().ForEach(c => topBorders.Add(c.Address.ColumnNumber - r.RangeAddress.FirstAddress.ColumnNumber + 1, c.Style.Border.TopBorderColor));
+
+                    Dictionary<Int32, IXLColor> bottomBorders = new Dictionary<int, IXLColor>();
+                    r.LastRow().Cells().ForEach(c => bottomBorders.Add(c.Address.ColumnNumber - r.RangeAddress.FirstAddress.ColumnNumber + 1, c.Style.Border.BottomBorderColor));
+
+                    Dictionary<Int32, IXLColor> leftBorders = new Dictionary<int, IXLColor>();
+                    r.FirstColumn().Cells().ForEach(c => leftBorders.Add(c.Address.RowNumber - r.RangeAddress.FirstAddress.RowNumber + 1, c.Style.Border.LeftBorderColor));
+
+                    Dictionary<Int32, IXLColor> rightBorders = new Dictionary<int, IXLColor>();
+                    r.LastColumn().Cells().ForEach(c => rightBorders.Add(c.Address.RowNumber - r.RangeAddress.FirstAddress.RowNumber + 1, c.Style.Border.RightBorderColor));
+
+                    r.Cells().Style.Border.OutsideBorderColor = value;
+
+                    topBorders.ForEach(kp => r.FirstRow().Cell(kp.Key).Style.Border.TopBorderColor = kp.Value);
+                    bottomBorders.ForEach(kp => r.LastRow().Cell(kp.Key).Style.Border.BottomBorderColor = kp.Value);
+                    leftBorders.ForEach(kp => r.FirstColumn().Cell(kp.Key).Style.Border.LeftBorderColor = kp.Value);
+                    rightBorders.ForEach(kp => r.LastColumn().Cell(kp.Key).Style.Border.RightBorderColor = kp.Value);
+                }
+            }
+        }
+
         public XLBorderStyleValues LeftBorder
         {
             get { return _leftBorder; }
@@ -263,6 +325,18 @@
             return _container.Style;
         }
 
+        public IXLStyle SetInsideBorder(XLBorderStyleValues value)
+        {
+            InsideBorder = value;
+            return _container.Style;
+        }
+
+        public IXLStyle SetInsideBorderColor(IXLColor value)
+        {
+            InsideBorderColor = value;
+            return _container.Style;
+        }
+
         public IXLStyle SetLeftBorder(XLBorderStyleValues value)
         {
             LeftBorder = value;
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/ClosedXML_Tests.csproj b/ClosedXML/ClosedXML/ClosedXML_Tests/ClosedXML_Tests.csproj
index 099c415..3f1f0f6 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/ClosedXML_Tests.csproj
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/ClosedXML_Tests.csproj
@@ -76,6 +76,7 @@
     <Compile Include="Excel\Cells\XLCellTest.cs" />
     <Compile Include="Excel\Columns\ColumnsTests.cs" />
     <Compile Include="Excel\Coordinates\XLAddressTest.cs" />
+    <Compile Include="Excel\Misc\StylesTest.cs" />
     <Compile Include="Excel\Misc\XLWorkbookTests.cs" />
     <Compile Include="Excel\Misc\Extensions.cs" />
     <Compile Include="Excel\NamedRanges\NamedRangesTests.cs" />
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Excel/Misc/StylesTest.cs b/ClosedXML/ClosedXML/ClosedXML_Tests/Excel/Misc/StylesTest.cs
new file mode 100644
index 0000000..a19ac80
--- /dev/null
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Excel/Misc/StylesTest.cs
@@ -0,0 +1,73 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Collections.Generic;
+using System.Linq;
+using ClosedXML.Excel;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace ClosedXML_Tests.Excel.Misc
+{
+    /// <summary>
+    /// Summary description for UnitTest1
+    /// </summary>
+    [TestClass]
+    public class StylesTest
+    {
+        [TestMethod]
+        public void InsideBorderTest()
+        {
+            var wb = new XLWorkbook();
+            var ws = wb.AddWorksheet("Sheet1");
+            var range = ws.Range("B2:D4");
+
+            SetupBorders(range);
+
+            range.Style.Border.InsideBorder = XLBorderStyleValues.Thin;
+            range.Style.Border.InsideBorderColor = XLColor.Red;
+
+            var center = range.Cell(2, 2);
+
+            Assert.AreEqual(XLColor.Red, center.Style.Border.TopBorderColor);
+            Assert.AreEqual(XLColor.Red, center.Style.Border.BottomBorderColor);
+            Assert.AreEqual(XLColor.Red, center.Style.Border.LeftBorderColor);
+            Assert.AreEqual(XLColor.Red, center.Style.Border.RightBorderColor);
+
+            Assert.AreEqual(XLBorderStyleValues.None, range.FirstRow().Cell(1).Style.Border.TopBorder);
+            Assert.AreEqual(XLBorderStyleValues.Thick, range.FirstRow().Cell(2).Style.Border.TopBorder);
+            Assert.AreEqual(XLBorderStyleValues.Double, range.FirstRow().Cell(3).Style.Border.TopBorder);
+
+            Assert.AreEqual(XLBorderStyleValues.None, range.LastRow().Cell(1).Style.Border.BottomBorder);
+            Assert.AreEqual(XLBorderStyleValues.Thick, range.LastRow().Cell(2).Style.Border.BottomBorder);
+            Assert.AreEqual(XLBorderStyleValues.Double, range.LastRow().Cell(3).Style.Border.BottomBorder);
+
+            Assert.AreEqual(XLBorderStyleValues.None, range.FirstColumn().Cell(1).Style.Border.LeftBorder);
+            Assert.AreEqual(XLBorderStyleValues.Thick, range.FirstColumn().Cell(2).Style.Border.LeftBorder);
+            Assert.AreEqual(XLBorderStyleValues.Double, range.FirstColumn().Cell(3).Style.Border.LeftBorder);
+
+            Assert.AreEqual(XLBorderStyleValues.None, range.LastColumn().Cell(1).Style.Border.RightBorder);
+            Assert.AreEqual(XLBorderStyleValues.Thick, range.LastColumn().Cell(2).Style.Border.RightBorder);
+            Assert.AreEqual(XLBorderStyleValues.Double, range.LastColumn().Cell(3).Style.Border.RightBorder);
+        }
+
+        private static void SetupBorders(IXLRange range)
+        {
+            range.FirstRow().Cell(1).Style.Border.TopBorder = XLBorderStyleValues.None;
+            range.FirstRow().Cell(2).Style.Border.TopBorder = XLBorderStyleValues.Thick;
+            range.FirstRow().Cell(3).Style.Border.TopBorder = XLBorderStyleValues.Double;
+            
+            range.LastRow().Cell(1).Style.Border.BottomBorder = XLBorderStyleValues.None;
+            range.LastRow().Cell(2).Style.Border.BottomBorder = XLBorderStyleValues.Thick;
+            range.LastRow().Cell(3).Style.Border.BottomBorder = XLBorderStyleValues.Double;
+            
+            range.FirstColumn().Cell(1).Style.Border.LeftBorder = XLBorderStyleValues.None;
+            range.FirstColumn().Cell(2).Style.Border.LeftBorder = XLBorderStyleValues.Thick;
+            range.FirstColumn().Cell(3).Style.Border.LeftBorder = XLBorderStyleValues.Double;
+
+            range.LastColumn().Cell(1).Style.Border.RightBorder = XLBorderStyleValues.None;
+            range.LastColumn().Cell(2).Style.Border.RightBorder = XLBorderStyleValues.Thick;
+            range.LastColumn().Cell(3).Style.Border.RightBorder = XLBorderStyleValues.Double;
+        }
+
+    }
+}