Change color of dropdown for specific field

Hi all,

I am working on building a form where I want the required fields to be colored in. For dropdown menus, I found the CSS to change the color but it applies to all dropdowns on the form. I want to apply it to a specific field only.

.sys_f_div_select  {
    background: url(../images/dropdown-arrow.svg) no-repeat scroll right top / 17px 17px #dde7f5; 

The property I am trying to get this to apply is here:

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