.nav_button {
            float:left;
            height:30px;
            width:17%;
            margin-left:1%;
            margin-right:1%;
            margin-bottom:1%;
            background:lightgreen;    
            border-radius:8px;
            border:none;
        }
        
.nav_button2 {
            float:left;
            height:30px;
            width:17%;
            margin-left:1%;
            margin-right:1%;
            margin-bottom:1%;
            background:khaki;    
            border-radius:8px;
            border:none;
}
        
.foot_button {
            float:left;
            height:30px;
            width:14%;
            margin:1%;
            background:lightblue;    
            border-radius:8px;
            border:none;
            margin-top:0px;
}