From the Knowledgebase

Changing button icons

​If you want to change the icons for the buttons, you would need to upload new images and point the CSS to those images. The icons are located in the /img/ directory of the plugin and the CSS to call those images:

/* DOWNLOAD BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-download::before {
​     content: url(../img/toolbarButton-download.png); 
​}  
/* ZOOM OUT BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-zoomout::before {
​     content: url(../img/toolbarButton-zoomOut.png); 
​}  
/* ZOOM IN BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-zoomin::before {
​     content: url(../img/toolbarButton-zoomIn.png); 
​}  
/* PREV PAGE BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-prev::before {
​     content: url(../img/toolbarButton-pageUp.png); 
​}  
/* NEXT PAGE BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-next::before {
​     content: url(../img/toolbarButton-pageDown.png); 
​}  
/* FULLSCREEN BUTTON IMAGE CSS */ 
​div.pdfemb-toolbar button.pdfemb-fs::before {
​     content: url(../img/toolbarButton-presentationMode.png); 
​}
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