Changing the background color of one menu item

Question has been asked several times before but the solutions provided haven’t worked for me. Thanks for the time in looking at this.

Here is the code from the menu:

.main-menu ul ul li a {
border-bottom-color: #08487e;
}
.main-menu ul ul li a {
background-color: #0B60A9;
}

There is also a color hover:

.main-menu ul ul li:hover > a {
background: #08487e;
}

Here is the theme I’m working with:

https://logitrans.themesawesome.com/

Thank you so much for your help in advance.

[bumps moderated – please provide more relevant information like a link to your site and the exact menu item …]