.button-spinner{
    width:12px;
    height:12px;
    display:inline-block;
    margin-right:10px;
    border-radius:50%;
    background:#FFF;
    animation:button-pulse 1.2s ease-in-out infinite;
}
@keyframes button-pulse{
    0%{
        transform:scale(.75);
        opacity:.45;
    }

    50%{
        transform:scale(1);
        opacity:1;
    }

    100%{
        transform:scale(.75);
        opacity:.45;
    }
}