newsupernova/vendor/magento/theme-adminhtml-backend/web/css/source/components/_spinner.less

// /**
//  * Copyright © Magento, Inc. All rights reserved.
//  * See COPYING.txt for license details.
//  */

//
//  Spinner
//  _____________________________________________

//  Base spinner

.spinner {
    ._spinner-loop(
    @spinner-spin-count,
    @spinner-rotate,
    @spinner-delay
    );
    ._spinner-keyframes();
    display: inline-block;
    font-size: @spinner__base-size;
    height: 1em;
    margin-right: 1.5rem;
    position: relative;
    width: 1em;

    > span {
        ._spinner_transform();
        background-color: @spinner-second-color;
        border-radius: @spinner-border-radius;
        clip: rect(0 1em/3.5 .1em 0);
        height: .1em;
        margin-top: 1em / 2;
        position: absolute;
        width: 1em;
    }
}

//  ToDo UI: remove old loaders style while loaders redesign

.popup-loading {
    background: rgba(255, 255, 255, .8);
    border-color: @color-light-phoenix;
    color: @color-light-phoenix;
    font-size: 14px;
    font-weight: bold;
    left: 50%;
    margin-left: -100px;
    padding: 100px 0 10px;
    position: fixed;
    text-align: center;
    top: 40%;
    width: 200px;
    z-index: 1003;

    &:after {
        background-image: url('@{baseDir}images/loader-1.gif');
        content: '';
        height: 64px;
        left: 50%;
        margin: -32px 0 0 -32px;
        position: absolute;
        top: 40%;
        width: 64px;
        z-index: 2;
    }
}

//  Loading mask
.loading-old,
.loading-mask {
    background: rgba(255, 255, 255, .4);
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 2003;

    img {
        display: none;
    }

    p {
        margin-top: 118px;
    }

    .loader {
        background: @color-ivory url('@{baseDir}images/loader-1.gif') no-repeat 50% 30%;
        border-radius: 5px;
        bottom: 0;
        color: @color-gray34;
        font-size: 14px;
        font-weight: bold;
        height: 160px;
        left: 0;
        margin: auto;
        opacity: .95;
        position: absolute;
        right: 0;
        text-align: center;
        top: 0;
        width: 160px;
    }
}