diff --git a/backend/handlers/onlyoffice.go b/backend/handlers/onlyoffice.go
index 309b248..f2c2461 100644
--- a/backend/handlers/onlyoffice.go
+++ b/backend/handlers/onlyoffice.go
@@ -225,6 +225,7 @@ func writePptxContents(w *zip.Writer) error {
   <Override PartName="/ppt/slides/slide1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slide+xml"/>
   <Override PartName="/ppt/slideLayouts/slideLayout1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slideLayout+xml"/>
   <Override PartName="/ppt/slideMasters/slideMaster1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slideMaster+xml"/>
+  <Override PartName="/ppt/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/>
 </Types>`,
 		"_rels/.rels": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
@@ -236,14 +237,60 @@ func writePptxContents(w *zip.Writer) error {
   xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
   <p:sldMasterIdLst><p:sldMasterId id="2147483648" r:id="rId1"/></p:sldMasterIdLst>
   <p:sldIdLst><p:sldId id="256" r:id="rId2"/></p:sldIdLst>
-  <p:sldSz cx="9144000" cy="6858000" type="screen4x3"/>
+  <p:sldSz cx="12192000" cy="6858000"/>
   <p:notesSz cx="6858000" cy="9144000"/>
 </p:presentation>`,
 		"ppt/_rels/presentation.xml.rels": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
   <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideMaster" Target="slideMasters/slideMaster1.xml"/>
   <Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="slides/slide1.xml"/>
+  <Relationship Id="rId3" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" Target="theme/theme1.xml"/>
 </Relationships>`,
+		"ppt/theme/theme1.xml": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<a:theme xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" name="Office Theme">
+  <a:themeElements>
+    <a:clrScheme name="Office">
+      <a:dk1><a:sysClr val="windowText" lastClr="000000"/></a:dk1>
+      <a:lt1><a:sysClr val="window" lastClr="FFFFFF"/></a:lt1>
+      <a:dk2><a:srgbClr val="44546A"/></a:dk2>
+      <a:lt2><a:srgbClr val="E7E6E6"/></a:lt2>
+      <a:accent1><a:srgbClr val="4472C4"/></a:accent1>
+      <a:accent2><a:srgbClr val="ED7D31"/></a:accent2>
+      <a:accent3><a:srgbClr val="A5A5A5"/></a:accent3>
+      <a:accent4><a:srgbClr val="FFC000"/></a:accent4>
+      <a:accent5><a:srgbClr val="5B9BD5"/></a:accent5>
+      <a:accent6><a:srgbClr val="70AD47"/></a:accent6>
+      <a:hlink><a:srgbClr val="0563C1"/></a:hlink>
+      <a:folHlink><a:srgbClr val="954F72"/></a:folHlink>
+    </a:clrScheme>
+    <a:fontScheme name="Office">
+      <a:majorFont><a:latin typeface="Calibri Light"/><a:ea typeface=""/><a:cs typeface=""/></a:majorFont>
+      <a:minorFont><a:latin typeface="Calibri"/><a:ea typeface=""/><a:cs typeface=""/></a:minorFont>
+    </a:fontScheme>
+    <a:fmtScheme name="Office">
+      <a:fillStyleLst>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+      </a:fillStyleLst>
+      <a:lnStyleLst>
+        <a:ln w="6350" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill></a:ln>
+        <a:ln w="12700" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill></a:ln>
+        <a:ln w="19050" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill></a:ln>
+      </a:lnStyleLst>
+      <a:effectStyleLst>
+        <a:effectStyle><a:effectLst/></a:effectStyle>
+        <a:effectStyle><a:effectLst/></a:effectStyle>
+        <a:effectStyle><a:effectLst/></a:effectStyle>
+      </a:effectStyleLst>
+      <a:bgFillStyleLst>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+        <a:solidFill><a:schemeClr val="phClr"/></a:solidFill>
+      </a:bgFillStyleLst>
+    </a:fmtScheme>
+  </a:themeElements>
+</a:theme>`,
 		"ppt/slideMasters/slideMaster1.xml": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <p:sldMaster xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"
   xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
@@ -251,11 +298,13 @@ func writePptxContents(w *zip.Writer) error {
   <p:cSld><p:spTree><p:nvGrpSpPr><p:cNvPr id="1" name=""/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr>
   <p:grpSpPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="0" cy="0"/><a:chOff x="0" y="0"/><a:chExt cx="0" cy="0"/></a:xfrm></p:grpSpPr>
   </p:spTree></p:cSld>
+  <p:clrMap bg1="lt1" tx1="dk1" bg2="lt2" tx2="dk2" accent1="accent1" accent2="accent2" accent3="accent3" accent4="accent4" accent5="accent5" accent6="accent6" hlink="hlink" folHlink="folHlink"/>
   <p:sldLayoutIdLst><p:sldLayoutId id="2147483649" r:id="rId1"/></p:sldLayoutIdLst>
 </p:sldMaster>`,
 		"ppt/slideMasters/_rels/slideMaster1.xml.rels": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
   <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout" Target="../slideLayouts/slideLayout1.xml"/>
+  <Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" Target="../theme/theme1.xml"/>
 </Relationships>`,
 		"ppt/slideLayouts/slideLayout1.xml": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <p:sldLayout xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"