.overlay-loader {
    position: fixed; /* Sit on top of the page content */
    width: 100%; /* Full width (cover the whole page) */
    height: 100%; /* Full height (cover the whole page) */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.2); /* Black background with opacity */
    z-index: 999; /* Specify a stack order in case you're using a different order for other elements */
    cursor: pointer; /* Add a pointer on hover */
}

.loader {
    position: fixed;
    border: 5px solid #f3f3f3;
    border-radius: 50%;
    border-top: 5px solid #555;
    width: 50px;
    height: 50px;
    -webkit-animation: spin 2s linear infinite; /* Safari */
    animation: spin 2s linear infinite;
    overflow: visible;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 999
}

/* Safari */
@-webkit-keyframes spin {
    0% {
        -webkit-transform: rotate(0deg);
    }

    100% {
        -webkit-transform: rotate(360deg);
    }
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}