.loader-wrapper {
    position: absolute;
    top: 0;
    width: 100%;
    height: calc(100vh);
    background: #222222;
    z-index: 9001;
    opacity: .9
}
.loader {
    display: block;
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 100px;
    height: 100px;
    animation: spin 2s linear infinite;
    margin: auto;
    margin-top: calc(40vh);
    opacity: 1;
    z-index: 9002;
}
.loader-small{
    display: block;
    border: 5px solid #f3f3f3;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
    border-top: 5px solid #555;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    margin: auto;
    margin-top: calc(40vh);
    opacity: 1;
    z-index: 9002;
}
/* Safari */
@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}

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