on button click page creates default url and button click event is not working

$('#<%=btndBlue.ClientID%>').click(function(event){
    event.preventDefault();
   Then write your code
});

Just add an onclick event to the button:

Put it in a JS block and give the button an ID:

<button id="btnSubmit" class="float-left submit-button" >Home</button>

<script type="text/javascript">
    document.getElementById("btnSubmit").onclick = function () {
        location.href = "www.yourwebsite.com";
    };
</script>