#pagamentowindows1 {
    background-color: rgba(0, 0, 0, 1);
    text-align: center;   
    height: 100%;  
    z-index: 10000;  
    top: 0px;
    position: fixed;   
    width: 100%; 
    left: 0;
}
#anima {
    position: absolute;
    top: 50%;
    max-width: 375px;
    left: 50%;
}

#anima {
    animation: animPreload 6s infinite;
}
@keyframes animPreload {
    0% {
        transform: scale(0); 
    }
    25% {
        transform: scale(0.5); 
    }
    50% {
        transform:scale(1); 
    }
    75% {
        transform:scale(0.5); 
    }
    100% {
        transform:scale(0); 
    }
}