@keyframes spinner {
    to {transform: rotate(360deg);}
}
 
@-webkit-keyframes spinner {
    to {-webkit-transform: rotate(360deg);}
}
 
.spinner {
    min-width: 30px;
    min-height: 30px;
}
 
.spinner:before {
    content: 'Cargando…';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 90px;
    height: 90px;
    margin: auto;
}
 
.spinner:not(:required):before {
    content: '';
    border-radius: 50%;
    border: 2px solid #494949;
    border-top-color: #C8C8C8;
    animation: spinner .6s linear infinite;
    -webkit-animation: spinner .6s linear infinite;
}