themes – Arc Dark Theme Fine Tuning

calendarthemes

I have just started to customize my Ubuntu a little bit and found the Arc-Dark theme to be exactly what I am looking for.

There are some small things though.

The color of the calendar on top is still white, and the font of the notifications and inside the calendar are off. This is what it looks like right now:

I would like to see the calendar being the same darker color, and maybe having the day numbers font in white.

Also the font color of the search bar is off. There is text, but it is just as dark as the background.

It's only visible when you hover over the search bar.

How would I go about changing/tweaking these things? Or did I do something wrong during the installation?

Edit:
UnKNOWn has answered my question (accepted answer).

The css-file was, in my instance, found at /usr/share/themes/Arc-Dark/gnome-shell/gnome-shell.css. I made the small changes to .calendar and .search-entry, saved the file (with sudo rights) and reloaded the theme by simply re-applying it with Gnome-Tweaks!

Best Answer

Basic areas to edit as per your wish from the arc-dark theme css file are below..

.search-entry {
  width: 320px;
  padding: 7px 9px;
  border-radius: 20px;
  border: 1px solid rgba(0, 0, 0, 0.25);
  background-color: blue; } /* edited this line  */

.calendar {
background-color: blue; /* added this line */
  margin-bottom: 1em; }

Related Solutions

Modify Gnome 3 Theme for Browser – Step-by-Step Guide

I'm suggesting a different way that is specific to Firefox to achieve what you want.

Close (exit) all instances of Firefox.
Go to your profile folder. It is here: /home/your_name/.mozilla/firefox/randomstring.default
In there, look for a subfolder called chrome. If it doesn't exist, create it.
If chrome does exist, look for a file called userContent.css. Otherwise, create an empty file with this name in the chrome folder.
Now open userContent.css with a text editor and paste in this code:
INPUT, TEXTAREA {color: black !important; background: #aaaaaa !important; }

Save the file (as plain text) and close the text editor.
Restart Firefox.
You should now have black text on a light gray background. You can use whatever color combination you prefer.

Notes: chrome and userContent.css are case-sensitive and should be spelled correctly.
The settings here will take precedence over those in the OS theme and will remain the same in Firefox irrespective of which gtk theme you switch to.

(By the way, you maybe interested in the Stylish extension and a whole variety of styles created by users and hosted at userstyles.org.)

Edit:
I'm providing some links related to users wanting Firefox not to be influenced by the OS (gtk) theme. Please note that I have not checked whether the solutions suggested still work or not. These links are more by way of background:
How can one make firefox ignore my GTK theme entirely?
Bug 70315 - text in menus and boxes unreadable if using dark GTK theme (for Seamonkey)
Any way to prevent Firefox from using the OS native colors?

Ubuntu – How to change the top bar font in GNOME 3.30.1

to make entire top bar items size:

change the content in your gnome-shell.css file under .themes folder like below, put any value for your preferred font-size.

/* TOP BAR */
#panel {
  background-color: rgba(39, 42, 42, 0.85);
  /* transition from solid to transparent */
  transition-duration: 250ms;
  font-weight: bold;
  height: 2em;
  font-size: 10px;
}

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