.add {
    margin: 20px;
    font-size: 30px;
    font-weight: bold;
    cursor:pointer;
}

 .screenlock {
    font-family: monospace;
}

.install {
    width: 80%;
    margin: auto;
    border: 1px solid #ccc;
    padding: 15px;
    border-radius: 25px;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
            0 25px 50px 0 rgba(0, 0, 0, 0.1);
}