Digeratimvp I'm unsure about the 'Home', 'Blog', 'Files' & 'Youtube' labels, although I'd guess they're likely from the Links extension(?)... which I don't use.
However in case you still needed to modify the rest of the default header icons & text, feel free to try this:
.Header-secondary .username, /*(OPEN) HEADER USERNAME (SELECTOR)*/
.item-notifications .Button-label, /*(OPEN) NOTIFICATIONS LABEL (SELECTOR)*/
.item-notifications .icon.fas.fa-bell, /*(OPEN) NOTIFICATIONS FA ICON (SELECTOR)*/
.item-search .Search-input, /*(OPEN) SEARCH FA ICON (SELECTOR)*/
.item-search .Search-clear.Button--icon, /*(OPEN) SEARCH CLEAR ICON (SELECTOR)*/
.item-search .Search-input input.FormControl { /*(OPEN) SEARCH INPUT TEXT (SELECTOR)*/
color: #fff; /*SET TEXT/ICON COLOR*/
} /*(CLOSE) ALL 6 PRECEDING (SELECTORS)*/
// <==========='SEARCH FORUM' PLACEHOLDER TEXT=>
.Search-input input::placeholder { /*(OPEN) SEARCH PLACEHOLDER (PSEUDO SELECTOR)*/
color: #fff !important; /*SET TEXT/ICON COLOR + !IMPORTANT*/
} /*(CLOSE) SEARCH PLACEHOLDER (PSEUDO SELECTOR)*/
Altogether, these will modify the color of the:
- Username
- Notifications Label (mobile only)
- Notifications FA Icon
- Search FA Icon
- Search Clear Icon
- Search Input Text
- 'Search Forum' Placeholder Text
Hope this helps.