*
{
    background-color: aliceblue;
    font-size: 1.2em;
    text-align: center;
}

button
{
    background-color: gray;
    border: none;
    color: white;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 1.2;
    margin: 4px 2px;
    transition-duration: 0.4s;
}

button:hover
{
    background-color: blue; /* Green */
    color: white;
    cursor: pointer;
}