diff --git a/uhepp-js/src/components/UheppHist.jsx b/uhepp-js/src/components/UheppHist.jsx
index 9fa19ca13ece41837ce4eccb89b9137b8d4c5966..1ba32d8a54e3706275bc8bb70133fb9919766b8a 100644
--- a/uhepp-js/src/components/UheppHist.jsx
+++ b/uhepp-js/src/components/UheppHist.jsx
@@ -992,7 +992,7 @@ const UheppHistPost = ({width, height, uhepp}) => {
   <div className="container text-right">
       <canvas className="d-none" ref={canvasRef} width={canvasWidth} height={canvasHeight}></canvas>
       { !pngDownload &&
-        <button className="btn btn-outline-primary"
+        <button className="btn btn-sm btn-outline-primary"
                 disabled={pngInProgress}
                 onClick={() => generatePng()}>
           { !pngInProgress && <span>
@@ -1004,7 +1004,7 @@ const UheppHistPost = ({width, height, uhepp}) => {
           </> }
         </button> }
       { pngDownload &&
-        <a href={pngDownload} download={uhepp.metadata.filename + ".png"} className="btn btn-primary">
+        <a href={pngDownload} download={uhepp.metadata.filename + ".png"} className="btn btn-sm btn-primary">
           <i className="fas fa-download"></i> Download .png
         </a> }
   </div>