.empty_del{ height: 10%}
   .caption
         {
            position: absolute;
            height: 10%;
            font: 50px David;
            text-align: center;
            background-color:orangered;
            color:yellow;
         }

        .buttons {
            position: absolute;
            width: 100%;
            left: 0%;
            font: 32px David;
            background-color: yellow;
            color: darkblue;
            text-align:center;
            font-weight: bolder;
        }

        .flip {
            background-color: powderblue;
            color: black;
        }
        .control {
            position: absolute;
            top:0%;
            width:50%;
            font: 50px David;
            text-align: center;
            height:10%;
           
        }
     .ok
        {
            left:50%;
            background-color:lime;
            color:indigo;
        }
     .exit{
        left: 0%;
        background-color: red;
        color: yellow; 
   
     }
     .im_buttons{
            position: absolute;
            top:10%;
            width:7%;
            left: 5%;
            height:10%;
            z-index: 500; 
            background-size: 100% 100%;
            
        }