Hi
You can change the rgba value as your need like the screenshot.
http://prntscr.com/q84cz8
IF you want to need change the color of above funfact section see the screenshot http://prntscr.com/q84k9e
.theme-project{
background-color:#000 !important;
}
.theme-project .theme-section-title {
color:#fff !important
}
let me know for further help.
Thanks