html - Div Background not showing up what's the solution? -


why background color in circles class not working? been trying 5 minutes what's wrong ?

html:

<!doctype html> <html lang="en"> <head>     <meta charset="utf-8">     <title>simon game</title>     <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.1/css/materialize.min.css">     <link rel="stylesheet" href="simon game.css"> </head> <body>     <div class="container">         <div class="row">             <div class="col s6">                 <div id="circle1" class="circles"></div>                 <div id="circle2" class="circles"></div>             </div>             <div class="col s6">                 <div id="circle3" class="circles"></div>                 <div id="circle4" class="circles"></div>                 </div>           </div>     </div>     <script src="simon game.js"></script> </body> </html>

css:

.circles {     color: black;     background: black; }

if container doesn't have content should provide fixed height , width in order see styles, try this

.circles {     color: black;     background: black;     width: 50px;     height:50px; }

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