Fix dropzone color on arc-green (#11514)

* Fix dropzone color on arc-green

* fix missing ;

* use same color as textarea and fix border

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/less/themes/theme-arc-green.less

@@ -1062,7 +1062,16 @@ input {
 }
 
 .ui.form .dropzone {
-    border: 2px dashed #4c505c;
+    border: 2px dashed #7f98ad;
+    background-color: #2e323e;
+
+    .dz-button {
+        color: rgba(158, 158, 158, .8);
+    }
+}
+
+.ui.form .dropzone:hover .dz-button {
+    color: rgba(158, 158, 158, 1);
 }
 
 .ui.basic.red.button,