Changing gallery image caption font inBrine template

Hi there, I am hoping to change my gallery block font for teh captions I am using in these drop down displays I have  https://www.soundsound.co.uk/speech > speech services 
and  https://www.soundsound.co.uk/music > music services 
I can't seem to get any of the code solutions posted elsewhere on this forum to work.

Any help would bne amazing, thanks!

Hamish

I already have this custom css on the site:

.quote-block blockquote { color: silver }
.sqs-widgets-audio-player {
    background: #683282 !important;
}
#block-yui_3_17_2_1_1601758406282_13090 [class*=sqs-block-button-container] {
  text-align: right;
}
#block-yui_3_17_2_1_1604881259521_14605 [class*=sqs-block-button-container] {
  text-align: left;
}
#block-716e51162c1b56bda8c3 + .row > .span-6 {
  width: 50% !important;
  float: left !important;
}

/* Small Button Styling */
.sqs-block-button-element--small {
 width: 80% !important;
}

@media screen and (max-width:767px) {
body.header--menu-open  .header-announcement-bar-wrapper {border:0 !important;}
body:not(header--menu-open) .header-announcement-bar-wrapper {border-bottom: 1px solid #333 !important;}
}
/* Buttons side by side */
@media screen and (max-width:767px) {
div#block-adc6d6ea68a568b7788b.span-12 .span-3 {
    width: 50% !important;
    float: left !important;
}
div#page-60495bd43ecb7b11913eb624 .span-12 .span-3:nth-child(2n+1) {

Hi,

You mean font name, font size, color or?

sorry for my late reply, yes font name, font size and color please. 

On 3/14/2023 at 12:06 AM, HamishC said:

sorry for my late reply, yes font name, font size and color please. 

Add to Design > custom CSS

span.c-tabs__tab-title {
    font-family: monospace;
    font-size: 30px;
    color: #f1f;
}