.shadow {
    width: 100%;
    height: 100%;
    background: radial-gradient(rgba(20, 20, 20, .5), rgba(0, 0, 0, .8));
    background: -webkit-radial-gradient(rgba(20, 20, 20, .5), rgba(0, 0, 0,.8));
    z-index:9000;
    position:fixed;
}
.middle-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    text-align: center;
    padding: 15px;
    width: 100%;
    max-width: 450px;
}
/* Loader start */
.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 1.0s infinite ease-in-out;
    animation: load7 1.0s infinite ease-in-out;
}
.loader {
    color: #ffffff;
    font-size: 20px;
    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;
    }
}
/* Loader end */