button {    
    margin: 15px;
    border: none;
    cursor: pointer;
    background-color: white;
    -webkit-transition: margin 0.5s ease-out;
    -moz-transition: margin 0.5s ease-out;
    transition: margin 0.5s ease-out;
    }

.ex1 button:hover 
    {    
    transform: translateY(-10px);
    }