javascript – When I step over the button it turns gray extjs

new Ext.Button({
    text: '<div style="color: white">INFORMA</div>'
    ,style: {
       'background-color': '#0099ff',
       'border-radius': '5px',
       'padding-left': '5px',
       'padding-right': '5px',
       'padding-top': '1px',
       'padding-bottom': '1px'
    ,handler : function() {

The problem I have is, when I put the mouse over the button it turns gray, and I would like it to remain the same color as it was before, blue. How could I fix it?

Before the mouse gets on top:


When mouse gets on top: