#precarga { 
    position: fixed;
    top: 0; 
    z-index: 9999; 
    width: 100%; 
    height: 100%; 
    overflow: visible; 
    background: #fff no-repeat center center; 
}
#preloader {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10000;
    width: 100%;
    height: 100%;
    overflow: visible;
    background: #fff no-repeat center center;
}
#icono_precarga{
    position: fixed;
    top: calc(50% - 20px);
    left: calc(50%  - 20px);
}

@keyframes spin-animation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(359deg);
    }
}

.icn-spinner {
    animation: spin-animation 2s infinite linear;
    display: inline-block;
}