loading screen at center

<style type="text/css">
.loading-background{
    background: none repeat scroll 0 0 rgba(22, 22, 22, 0.3);
    height: 100%;
    left: 0;
    margin: 0;
    padding: 0;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 100;
}
.loading-wrapper {
    background: none repeat scroll 0 0 rgba(0, 0, 0, 0);
    border: 0 none;
    height: 100px;
    left: 50%;
    margin-left: -50px;
    margin-top: -50px;
    position: fixed;
    top: 50%;
    width: 100px;
    z-index: 9999999;
}
.loading-contain {
    background-color: #FFFFFF !important;
    border-radius: 13px;
    display: block;
    height: 100px;
    line-height: 100px;
    margin: 0;
    padding: 1px;
    text-align: center;
    width: 100px;
}
    </style>

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<div class="loading-background">
    <div class="loading-wrapper">
        <span class="loading-contain">Please Wait <br/> Loading....</span>
    </div>
</div>