Can I customise the colour of link text colour on a specific block

Site URL: https://porcupine-duck-zbe8.squarespace.com/experiences

I am wondering if I can customise the colour of the link text on specific sections of my website. 

For example I have one section on a deep blue background so would like the link to be white (including the underline)

and then below I would like the link to be the deep blue to match the text 

I am also having an issue with the custom colour of the blocks. I have used the code 

#block-882c1b14404aa29216bd p {color: #FFFF !important;
}

Which works when I am in the CSS editor but when I click off it is sometimes defaulting to black. Any ideas on this also welcomed!
 

#1. Add to Design > Custom CSS

/* read more color */
div#block-882c1b14404aa29216bd a {
    color: white;
    border-color: white;
}
/* read more 2 color */
div#block-5a1039435d1b66ca9c09 a {
    color: black;
    border-color: black;
}

Thanks @tuanphan - brilliant as always!