.spanner {
    position: fixed;
    top: 50%;
    left: 0;
    background: (0, 0, 0, 0.9);
    width: 100%;
    display: block;
    text-align: center;
    height: 300px;
    color: #fff;
    transform: translateY(-50%);
    visibility: hidden;
    z-index: 99999;
}

.overlay {
    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    visibility: hidden;
    z-index: 99998;
}

.loader,
.loader:before,
.loader:after {
    border-radius: 50%;
    width: 2em;
    height: 2em;
    -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: 8px;
    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;
}