Point 1: You are using BuddyPress Registration Form and the connected page in wp-admin > Settngs > BuddyPress > Pages > Register
will act as a registration page
I connected the corrrect page and now it is working fine:
http://prntscr.com/rwoc6o
And on this page the shortcode was not pasted properly now working fine:
http://prntscr.com/rwoeex
Point 3: Paste this custom CSS in wp-admin > Appearance > Customize > Custom CSS
http://prntscr.com/rwoh4b
.my-account #buddypress div#item-header #item-header-content, .my-account #buddypress div#item-header #item-header-content h3 a, .my-account #buddypress div#item-header #item-header-content .location{
color:#ffffff !important;
}
.my-account #buddypress #item-nav #object-nav > ul{background:#dc3545 !important;}