body
{
    background-repeat: no-repeat;
    background-color: #000;
    background-image: url(../images/fondo2015.jpg);
    background-attachment: fixed;
    background-position: 0% 0%;
    background-clip: border-box;
    background-origin: padding-box;
    background-size: 100% 100%;
    font-family: 'Ubuntu', sans-serif;
}

button, .clickable
{
    cursor: pointer;
}

.centered
{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}