007 fonksiyoncss.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Resim Değiş</title>
    <style>
        #takim{font-size: 40px;}
    </style>
</head>
<body>
    <div id="takim"></div>

    <button onclick="fener()">Fenerbahçe</button>
    <button onclick="besiktas()">Beşiktaş</button> 
    <button onclick="galatasaray()">Galatasaray</button>

<script>
        function fener(){
            document.getElementById("takim").innerHTML="Fener";
            document.getElementById("takim").style.color = "blue";
            document.getElementById("takim").style.background = "yellow";
        }

        function besiktas(){
            document.getElementById("takim").innerHTML="Beşiktaş";
            document.getElementById("takim").style.color = "white";
            document.getElementById("takim").style.background = "black";

        }
        function galatasaray(){
            document.getElementById("takim").innerHTML="Galatasaray";
            document.getElementById("takim").style.color = "yellow";
            document.getElementById("takim").style.background = "red";

        }
</script>
</body>
</html>