Update unraid-base.css for Unraid 7

[pnancke]

---

• I have read the contributing guideline and understand that I have made the correct modifications

• PR's are done against the develop branch.

---

Bug fixes

• When submitting bugfixes please show a before and after screenshot of the fix, and a description of what the fix does.

Description:

unRAID 7 introduced changed the background of some elements and introduces some unstyled elements as mentioned in #663.

Adjusted Background in the Dashboard:

Before:

After:

Dashboard Button Transparent Background

Before:

After:

Focused Textarea Background

Before:

After:

Content Header Background in Settings

Before:

After:

Benefits of this PR and context:

It fixes the background of elements in the unraid dashboard

How Has This Been Tested?

I've tested this by importing
<link type="text/css" rel="Stylesheet" href="https://theme-park.dev/css/base/unraid/space-gray.css" />

as well as the following lines lines which contain the changes of this PR in the Theme Engine -> Custom styling (advanced) section

<style>
table {
    background: var(--transparency-dark-25) !important;
}

table td.stopgap {
    display: none;
}

table.dashboard i.fa {
    background-color: unset;
}

table.dashboard tbody {
    border: var(--transparency-light-25) 1px solid;
}

textarea:focus {
    background: var(--transparency-dark-35);
}

.content #title {
    background: unset;
}

</style>

Source / References:

#663

[GilbN]

Thanks for the PR!