2 added 212 characters in body
source | link

Find id of that WP. Something like WebPartTitleWPQ4. Edit that page and insert script editor WP and add <style>

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    color: #fff;
}
</style>

EDIT Find where is title. For ex.

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    }
#WebPartTitleWPQ4 h2 span {
    color: #fff;
}
</style>

Find id of that WP. Something like WebPartTitleWPQ4. Edit that page and insert script editor WP and add <style>

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    color: #fff;
}
</style>

Find id of that WP. Something like WebPartTitleWPQ4. Edit that page and insert script editor WP and add <style>

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    color: #fff;
}
</style>

EDIT Find where is title. For ex.

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    }
#WebPartTitleWPQ4 h2 span {
    color: #fff;
}
</style>
1
source | link

Find id of that WP. Something like WebPartTitleWPQ4. Edit that page and insert script editor WP and add <style>

<style>
#WebPartTitleWPQ4 h2 {
    background-color: #000; 
    color: #fff;
}
</style>