Help with div

How to make line where is Полезное from mainmenu that line where is white

.phdr class

I know which class i mean how to make to text have white background

Here is css of my site

screneshot please

.phdr{
color:#fff; /* text color */
background:#000; /* bg color */
}

# Libra (21.01.2015 / 18:39)
.phdr{
color:#fff; /* text color */
background:#000; /* bg color */
}

Ill try

I only want to text have bg like whole line is wuth bg blue then text with bg white

If i kniw where to put this code for text
display: inline-block;
border: 1px solid #0000ff;

where to put for text xD