With CSS3 every aspect of the Webpage can be can customized. This CSS code snippet will change the highlight color of the select text both its background and foreground color.
/* Chrome/Firefox/Edge */
::-moz-selection {
background-color: #445446;
color: #0fe4e4;
}
/* Safari */
::selection {
background-color: #445446;
color: #0fe4e4;
}
This is be rendered like the following image.

This is tested in Google Chorme, Firefox and Microsoft Edge browser.