spinner

spinner.html

<div class="clearfix loader" style="margin: 18px 15px 0; display: none;">
    <div class="spinner" style="float: left; display: inline-block;"></div>
    <!-- optional -->
    <div class="" style="float: left; display: inline-block; color: #CCCCCC">Auto Saving</div>
</div>

spinner.less

.center-page {
    top: 50%;
    left: 50%;
    right: 50%;
    bottom: 50%;
    margin-top: -40px;
    margin-left: -40px;
    position: absolute;
}

.spinner {
    width: 30px;
    height: 30px;
    margin-top: -4px;
    margin-right: 10px;
    border-radius: 100%;
    background-color: #333;
    -webkit-animation: sk-scaleout 1s infinite ease-in-out;
    animation: sk-scaleout 1s infinite ease-in-out;
}

@-webkit-keyframes sk-scaleout {
    0% { -webkit-transform: scale(0) }
    100% {
        -webkit-transform: scale(1.0);
        opacity: 0;
    }
}

@keyframes sk-scaleout {
    0% {
        -webkit-transform: scale(0);
        transform: scale(0);
    } 100% {
        -webkit-transform: scale(1.0);
        transform: scale(1.0);
        opacity: 0;
    }
}