styles.css

        body .redactor_toolbar li a.redactor_btn_styles              { background:url(data:image/png;base64,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);}

        @media
        only screen and (-webkit-min-device-pixel-ratio: 2),
        only screen and (   min--moz-device-pixel-ratio: 2),
        only screen and (     -o-min-device-pixel-ratio: 2/1),
        only screen and (        min-device-pixel-ratio: 2),
        only screen and (                min-resolution: 192dpi),
        only screen and (                min-resolution: 2dppx) {  
            body .redactor_toolbar li a.redactor_btn_styles              { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADYAAAA2CAYAAACMRWrdAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyNpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDE0IDc5LjE1MTQ4MSwgMjAxMy8wMy8xMy0xMjowOToxNSAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIChNYWNpbnRvc2gpIiB4bXBNTTpJbnN0YW5jZUlEPSJ4bXAuaWlkOkU5MEMxNTgyRTlCOTExRTJCODU0Rjk5MzYyREE4QjZGIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOkU5MEMxNTgzRTlCOTExRTJCODU0Rjk5MzYyREE4QjZGIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6RTkwQzE1ODBFOUI5MTFFMkI4NTRGOTkzNjJEQThCNkYiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6RTkwQzE1ODFFOUI5MTFFMkI4NTRGOTkzNjJEQThCNkYiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz4VuRmvAAADHklEQVR42uyYQWgTQRSGdzcJ2oSQVkraShHEgxDwKBUsBQtBSo6mUKvixYMt5lj1IEgs0gQKGogREg+FKAbaQnNQaUGo0ENpCDFF0jaHghFECpIYCE2bTeK/cZVl2QjN7jpB5sEc9r3Z3ffNvHlvZth6vc78j8JSMApGwSgYBaNgFIyCUTDVIoCpaZLvuDwez5jb7T4h0XF45qTPlUrlOnTXFPy4uLq6Ojc+Pu6D3azWR06DgWF5nr+8vr7u5zjuaVdXVwSOnRPNt8Qm9Duzvb0djEajT8xmsw8AV9DPJNqGNzc334fD4ZuHh4f3DAbDOzncUUU1GMuydTiy1d/f/8VkMn2HYxmoc3DWUKvVHsM+Aye7ofva19f30W6356vV6h76fVpYWKiIUG/9fv8x6BhAM7APqYXjNFmoLJsD2KNSqXQHbQYO/4B6JJVKdcNxITTH0Ge/s7Mz7HK5bh8cHEyhz44cymazhWZnZz/39PQ04PDOG8AZiSQP/FwalscBNhWPxyeTyWRvLpf7Y7NarQWsr7lyuewFVEEOBfFDfx/6B4uLi9OxWEzQVdFOzs/P7xEF+w2Xz+dH0un03Y2NjQuJRILButuC3lcoFJbgfPEvUBMrKyuhSCTSCHHIDehfteSjVllR4bu9AKwhlIQ2INEPA7qM5FGHXmg+UT+xvLzc0I2OjtakmbMVv4y6FUiW/YYfLLG/hj4hyX7SmRLEhiQziZl6Jp8pogVaHoqyWTuF0WfgZK4JVEMcDgeTyWSaQrXio65g0vBrBiUtG5I1dVYckJ1WwThGZ2kByoTsGUBNDGGd2YnWMQ2hLMVicRrp/RJMQxaL5QXgTrfVGjsqlOzdh2IoelsNRWM7zJSC2Uf82KJQoNVCKdZa0lsqzaGIg+kFRRRMTyhiYBBdoUiBDWSz2Q9er1c3KFI7j/O7u7u6QpHaeTx3Op2vBwcH2wpKqzVmwDE+GgwGr66trekCReygKVzc8Dz/MhAI1LAV4pWu1/71FaGmJ2g8dwCqox3uPukVNwWjYBSMglEwCkbBKBgFo2AUjIJRME3lpwADANerdTCHkHbkAAAAAElFTkSuQmCC);
            background-size: auto 28px;
            }
        }