diff --git a/convert-w2p.js b/convert-w2p.js
index 02dac87..00f1670 100644
--- a/convert-w2p.js
+++ b/convert-w2p.js
@@ -881,8 +881,10 @@ async function convert(input) {
         if (n.styles.boxShadow && n.styles.boxShadow !== 'none') {
           var shadowMatch = n.styles.boxShadow.match(/rgba?\(([^)]+)\)\s+(\d+)px\s+(\d+)px\s+(\d+)px/);
           if (shadowMatch) {
-            var shadowColor = rgbaToHex('rgb(' + shadowMatch[1] + ')') || '999999';
-            shapeOpts.shadow = { type: 'outer', blur: parseInt(shadowMatch[4]), offset: parseInt(shadowMatch[3]), color: shadowColor, opacity: 0.5 };
+            var shadowParts = shadowMatch[1].split(',').map(s => s.trim());
+            var shadowColor = rgbaToHex('rgb(' + shadowParts.slice(0,3).join(',') + ')') || '999999';
+            var shadowAlpha = shadowParts.length > 3 ? parseFloat(shadowParts[3]) : 0.3;
+            shapeOpts.shadow = { type: 'outer', blur: parseInt(shadowMatch[4]), offset: parseInt(shadowMatch[3]), color: shadowColor, opacity: Math.round(shadowAlpha * 100) / 100 };
           }
         }
         
diff --git a/web-to-ppt/convert-browser.js b/web-to-ppt/convert-browser.js
index b8697e4..b8cbac3 100644
--- a/web-to-ppt/convert-browser.js
+++ b/web-to-ppt/convert-browser.js
@@ -479,8 +479,10 @@ async function convertToPptx(input, onProgress) {
         if (n.styles.boxShadow && n.styles.boxShadow !== 'none') {
           var shadowMatch = n.styles.boxShadow.match(/rgba?\(([^)]+)\)\s+(\d+)px\s+(\d+)px\s+(\d+)px/);
           if (shadowMatch) {
-            var shadowColor = rgbaToHex('rgb(' + shadowMatch[1] + ')') || '999999';
-            shapeOpts.shadow = { type: 'outer', blur: parseInt(shadowMatch[4]), offset: parseInt(shadowMatch[3]), color: shadowColor, opacity: 0.5 };
+            var shadowParts = shadowMatch[1].split(',').map(function(s) { return s.trim(); });
+            var shadowColor = rgbaToHex('rgb(' + shadowParts.slice(0,3).join(',') + ')') || '999999';
+            var shadowAlpha = shadowParts.length > 3 ? parseFloat(shadowParts[3]) : 0.3;
+            shapeOpts.shadow = { type: 'outer', blur: parseInt(shadowMatch[4]), offset: parseInt(shadowMatch[3]), color: shadowColor, opacity: Math.round(shadowAlpha * 100) / 100 };
           }
         }