Untitled

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
<div onclick="f()" id="block"></div>
<div id="menu"><button class="b">Mneu</button><button class="b">Mneu</button><button class="b">Mneu</button><button class="b">Mneu</button><button class="b">Mneu</button><button class="b">Mneu</button><button class="b">Mneu</button></div>
<style type="text/css">
    .b{width: 80px; height: 50px;margin: 10px;opacity: 0.7;background-color: rgb(140,0,160);color:white;border:0;}
    #block{
        width: 100px;
        height: 100px;
        background-color: black;
        animation:2s block1 infinite ;
    }
    #menu{
        width: 100px;
        height: 80%;
        background-color: teal;
        opacity: 0.8;
        position: fixed;
        right: 0px;
        top: 10%;
    }
    @keyframes fadein{
        from{opacity: 0;right: -100px;}
        to{opacity: 0.8;right: 0px;}
    }
    @keyframes fadeout{
        from{opacity: 0.8;right: 0px;}
        to{opacity: 0;right: -100px;}
    }
    @keyframes block1{
        0%{transform: rotate(0deg);border-radius: 0%;background-color: black}
        50%{transform: rotate(360deg);border-radius: 60%;background-color: red}
        100%{transform: rotate(720deg);border-radius: 0%;background-color: black}
    }
</style>
<script type="text/javascript">
    var k =  1;
    function f(){
        if(k>0){
        document.getElementById('menu').style.animation = "1s fadeout 1";
        document.getElementById('menu').style.right = "-100px";
        document.getElementById('menu').style.opacity = "0";
    }
        else{
        document.getElementById('menu').style.animation = "1s fadein 1"
        document.getElementById('menu').style.right = "0px";
        document.getElementById('menu').style.opacity = "0.8";
}
        k=-k;
    }
</script>
</body>
</html>