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The hr html entity needs to be styled with both color and background-color attributes to display the desired color in all browsers. It is also adviced to define border 0 for the hr in the style sheet.

Example:

 
hr {
color: #c7c7c7;
background-color: #c7c7c7;
border: 0;
margin-bottom: 1em;
margin-top: 1em;
}