wtf

<!DOCTYPE html>
<body>
    <p id="content1"></p>
    <p id="concent2"></p>
    <button onclick="addClass()">Promijeni</button>
    <button onclick="removeClass()">Vrati</button>
    <br><br>
    <input type="text" id= "ime">
    <button onclick="getIme()">Dohvati ime</button>
    <p id="concent3"></p>
    <p id="concent4"></p>
    <p id="student1"></p>
    <button onclick="povecajOcjenu1()">Povecaj ocjenu</button>
    <p id="student2"></p>
    <button onclick="povecajOcjenu2()">Povecaj ocjenu</button>
    <p id="student3"></p>
    <button onclick="povecajOcjenu3()">Povecaj ocjenu</button>
</body>body>