Editing the link colour color in easy-twitter-feed-widget

I am having trouble editing the link colour of the credit link
I have tried editing the link colour in the widget setting,
also I have tried to edit the colour in my custom css.
But it is still displaying as the default grey, which disappeard against my footer background

here is my custom css:
.timeline-Tweet-retweetCredit, p.timeline-Tweet-text a:link, p.timeline-Tweet-text a:visited, p.timeline-Tweet-text a:hover, p.timeline-Tweet-text a:active {color: #000000 !important;}

here is the plugin css that seems to override my css despite using !important

.timeline-Tweet-retweetCredit {
    margin-bottom: 8px;
    margin-left: 18px;
    font-size: 12px;
    color: #889ba6;
}

The page I need help with: [log in to see the link]