diff --git a/adminer/static/arrow.gif b/adminer/static/arrow.gif
deleted file mode 100644
index d99badb5..00000000
Binary files a/adminer/static/arrow.gif and /dev/null differ
diff --git a/adminer/static/cross.gif b/adminer/static/cross.gif
deleted file mode 100644
index 7031822e..00000000
Binary files a/adminer/static/cross.gif and /dev/null differ
diff --git a/adminer/static/default.css b/adminer/static/default.css
index 8bb4ab04..71d46840 100644
--- a/adminer/static/default.css
+++ b/adminer/static/default.css
@@ -64,10 +64,6 @@ input.wayoff { left: -1000px; position: absolute; }
 .icon { width: 18px; height: 18px; background-color: navy; border: 0; vertical-align: middle; }
 .icon span { display: none; }
 .icon:hover { background-color: red; }
-.icon-up { background-image: url(up.gif); }
-.icon-down { background-image: url(down.gif); }
-.icon-plus { background-image: url(plus.gif); }
-.icon-cross { background-image: url(cross.gif); }
 .size { width: 7ex; }
 .help { cursor: help; }
 .footer { position: sticky; bottom: 0; margin-right: -20px; border-top: 20px solid rgba(255, 255, 255, .7); border-image: linear-gradient(rgba(255, 255, 255, .2), #fff) 100% 0; }
@@ -91,9 +87,15 @@ input.wayoff { left: -1000px; position: absolute; }
 #schema { margin-left: 60px; position: relative; user-select: none; -webkit-user-select: none; }
 #schema .table { border: 1px solid silver; padding: 0 2px; cursor: move; position: absolute; }
 #schema .references { position: absolute; }
-#schema .arrow { height: 1.25em; background: url(arrow.gif) no-repeat right center; }
 #help { position: absolute; border: 1px solid #999; background: #eee; padding: 5px; font-family: monospace; z-index: 1; }
 
+/* inlined here and not in compile.php because otherwise the development version flickers a little bit when loading the images */
+.icon-up { background-image: url(data:image/gif;base64,R0lGODlhEgASAIEAMe7u7gAAgJmZmQAAACH5BAEAAAEALAAAAAASABIAAQIghI+py+0PTQhRTgrvfRP0nmEVOIoReZphxbauAMfyHBcAOw==); }
+.icon-down { background-image: url(data:image/gif;base64,R0lGODlhEgASAIEAMe7u7gAAgJmZmQAAACH5BAEAAAEALAAAAAASABIAAQIghI+py+0PTQjxzCopvltX/lyix0wm2ZwdxraVAMfyHBcAOw==); }
+.icon-plus { background-image: url(data:image/gif;base64,R0lGODlhEgASAIEAMe7u7gAAgJmZmQAAACH5BAEAAAEALAAAAAASABIAAQIhhI+py+0PTQjxzCopvm/6rykgCHGVGaFliLXuI8TyTMsFADs=); }
+.icon-cross { background-image: url(data:image/gif;base64,R0lGODlhEgASAIEAMe7u7gAAgJmZmQAAACH5BAEAAAEALAAAAAASABIAAQIjhI+py+0PIwph1kZvfnnDLoFfd2GU4THnsUruC0fCTNc2XQAAOw==); }
+#schema .arrow { height: 1.25em; background: url(data:image/gif;base64,R0lGODlhCAAKAIAAAICAgP///yH5BAEAAAEALAAAAAAIAAoAAAIPBIJplrGLnpQRqtOy3rsAADs=) no-repeat right center; }
+
 .rtl h2 { margin: 0 -18px 20px 0; }
 .rtl p, .rtl table, .rtl .error, .rtl .message { margin: 1em 0 0 20px; }
 .rtl .logout { left: 0; right: auto; }
diff --git a/adminer/static/down.gif b/adminer/static/down.gif
deleted file mode 100644
index 70113bcc..00000000
Binary files a/adminer/static/down.gif and /dev/null differ
diff --git a/adminer/static/plus.gif b/adminer/static/plus.gif
deleted file mode 100644
index a15bc8c2..00000000
Binary files a/adminer/static/plus.gif and /dev/null differ
diff --git a/adminer/static/up.gif b/adminer/static/up.gif
deleted file mode 100644
index d37ffe49..00000000
Binary files a/adminer/static/up.gif and /dev/null differ
diff --git a/compile.php b/compile.php
index 66f8445b..cfa606f8 100755
--- a/compile.php
+++ b/compile.php
@@ -204,11 +204,8 @@ if (!$translations) {
 function minify_css($file) {
 	global $project;
 	if ($project == "editor") {
-		$file = preg_replace('~.*\.gif.*~', '', $file);
+		$file = preg_replace('~.*\.url\(.*~', '', $file);
 	}
-	$file = preg_replace_callback('~url\((\w+\.(gif))\)~', function ($match) {
-		return "url(data:image/$match[2];base64," . base64_encode(file_get_contents(__DIR__ . "/adminer/static/$match[1]")) . ")";
-	}, $file);
 	return lzw_compress(preg_replace('~\s*([:;{},])\s*~', '\1', preg_replace('~/\*.*?\*/\s*~s', '', $file)));
 }