.loader {
    border-top-color: #FF0000;
    -webkit-animation: spinner 1.5s linear infinite;
    animation: spinner 0.8s linear infinite;
}
@-webkit-keyframes spinner {
    0% {
        -webkit-transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
    }
}

@keyframes spinner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

#overlay {
    position: absolute;
    display: none;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 2;
    cursor: pointer;
  }