#composer-selector {
    top: 50%;
    left: 50%;
    width: 400px;
    height: auto;
    margin-left: -200px;
    margin-top: -200px;
    position: absolute;
    background-color: #fff;
    padding: 10px;
}

#composer-selector h3{
    margin-bottom: 15px;
    text-align: center;
}

#composer-selector .button {
    background-color: #ed4f4f;
    color: #fff;
    padding: 10px;
    text-decoration: none;
    text-transform: uppercase;
    display: block;
    text-align: center;
    margin: 10 auto;
    border-radius: 10px;
}