.wrapper{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    text-align:center;
    transform: translateX(-50%);
    }

    .spanner{
    position:fixed;
    top: 50%;
    left: 0;
    background: #2a2a2a55;
    width: 100%;
    display:block;
    text-align:center;
    height: 100%;
    color: #FFF;
    transform: translateY(-50%);
    z-index: 1000;
    visibility: hidden;
    }

    .overlay{
    position: fixed;
        width: 100%;
        height: 100%;
    background: rgba(0,0,0,0.5);
    visibility: hidden;
    }

    .loader,
    .loader:before,
    .loader:after {
    border-radius: 50%;
    width: 2.5em;
    height: 2.5em;
    -webkit-animation-fill-mode: both;
    animation-fill-mode: both;
    -webkit-animation: load7 1.8s infinite ease-in-out;
    animation: load7 1.8s infinite ease-in-out;
    }
    .loader {
    color: #ffffff;
    font-size: 10px;
    margin: 80px auto;
    position: relative;
    text-indent: -9999em;
    -webkit-transform: translateZ(0);
    -ms-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-animation-delay: -0.16s;
    animation-delay: -0.16s;
    }
    .loader:before,
    .loader:after {
    content: '';
    position: absolute;
    top: 0;
    }
    .loader:before {
    left: -3.5em;
    -webkit-animation-delay: -0.32s;
    animation-delay: -0.32s;
    }
    .loader:after {
    left: 3.5em;
    }
    @-webkit-keyframes load7 {
    0%,
    80%,
    100% {
        box-shadow: 0 2.5em 0 -1.3em;
    }
    40% {
        box-shadow: 0 2.5em 0 0;
    }
    }
    @keyframes load7 {
    0%,
    80%,
    100% {
        box-shadow: 0 2.5em 0 -1.3em;
    }
    40% {
        box-shadow: 0 2.5em 0 0;
    }
    }

    .show{
    visibility: visible;
    }

    .spanner, .overlay{
        opacity: 0;
        -webkit-transition: all 0.3s;
        -moz-transition: all 0.3s;
        transition: all 0.3s;
    }

    .spanner.show, .overlay.show {
        opacity: 1
    }