.loader {
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 9999;
    background: url('../img/carregando.gif') 50% 50% no-repeat black;
    opacity : 0.5;
}  

.form-control{
    text-transform: uppercase;
}