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Thanks a lot LeonidS , it helped me a lot.
if it helps for If anybody with also no CSS idea needs the same, the lines to add that worked for me were:
.bx-spl-cicon.connect svg path {
stroke:white;
}
.bx-spl-cicon.share svg path {
stroke:white;
}
.bx-spl-cicon.create svg path {
stroke:white;
}
.bx-def-font-grayed {
color: rgba(255,255,255,.9);
}
.bx-def-font-h2 {
font-weight: 400;
color: rgba(255,255,255,.9);
}