.loading {
    position: fixed;
    z-index: 20000;
    overflow: show;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 50px;
    height: 50px;
    display: none;
}

/* Transparent Overlay */
.loading:before {
content: '';
display: block;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(255,255,255,0.5);
}

/* :not(:required) hides these rules from IE9 and below */
.loading:not(:required) {
/* hide "loading..." text */
font: 0/0 a;
color: transparent;
text-shadow: none;
background-color: transparent;
border: 0;
}

.loading:not(:required):after {
content: '';
display: block;
font-size: 10px;
width: 50px;
height: 50px;
margin-top: -0.5em;

border: 15px solid rgba(33, 150, 243, 1.0);
border-radius: 100%;
border-bottom-color: transparent;
-webkit-animation: spinner 1s linear 0s infinite;
animation: spinner 1s linear 0s infinite;


}
@-webkit-keyframes spinner {
0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
}
100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
}
}
@-moz-keyframes spinner {
0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
}
100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
}
}
@-o-keyframes spinner {
0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
}
100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
}
}
@keyframes spinner {
0% {
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
}
100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
}
}