body{
    font-family: 'Open Sans', sans-serif;
}
.keyboard2 {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 350px;
    margin: 0px auto;
}
.keyboard2 button {
    width: 55px;
    height: 60px;
    margin: 5px;
    font-size: 18px;
    cursor: pointer;
    border: 1px solid #ccc;
    border-radius: 5px;
    /*background-color: #74a1ff;*/
    background-image: linear-gradient(to bottom left, #74a1ff, #2b6099, #07396e);
    /*07396e*/
    transition: background-color 0.5s;
    color: white;
}
.keyboard2 button:hover {
    background-color: #e0e0e0;
    color: black;
}